Your phone has a strong signal and mobile data works on the phone itself — but when you turn on the hotspot and connect a laptop or tablet, nothing loads. This guide identifies every common cause of tethering failure and gives a step-by-step fix for each.
The most time-efficient approach is to work through the causes in order: plan restrictions and data caps first (account-level issues you cannot fix on the device), then APN settings, then device and OS configuration.
Quick diagnostic — which symptom applies?
| Symptom | Most likely cause |
|---|---|
| Hotspot toggle turns on but tethered device finds no network to join | Plan does not include tethering; carrier blocks the hotspot at the network level |
| Tethered device joins the hotspot but shows “No Internet” or “Limited” | Hotspot data exhausted, wrong tethering APN, or wrong password entered |
| Tethered device joins and internet works, but very slowly | Hotspot data cap reached and speed is throttled; or carrier-applied hotspot speed limit |
| Hotspot option is missing from phone settings entirely | Plan not provisioned for tethering; carrier profile may need updating |
| Only the phone has internet after connecting via USB | USB tethering not enabled in phone settings; computer driver not installed |
Use this table to jump directly to the relevant cause below.
Cause 1: The Plan Does Not Include Tethering
Many mobile plans, particularly budget plans and older MVNO plans, do not permit tethering at all. When tethering is blocked at the carrier network level, the phone’s hotspot toggle may turn on without error, but tethered devices receive no internet access regardless of any device-side settings.
How to check:
- Open your carrier’s official app or log in to the account portal.
- Navigate to the active plan details — specifically the full plan terms, not the marketing summary.
- Search for “hotspot”, “tethering”, or “Personal Hotspot”.
- If tethering is permitted, the terms will state the allowance. If there is no mention, contact carrier support directly.
Fix:
If the plan excludes tethering, the only solutions are to upgrade to a plan that includes it or to add a tethering add-on if the carrier offers one. No device-side setting can enable tethering that the carrier network blocks.
For context on why MVNOs more commonly restrict tethering than MNOs, see How Tethering Works and How to Set It Up.
Cause 2: The Hotspot Data Allowance Is Exhausted
Many plans separate “hotspot data” from general on-device data. A plan may allow, for example, 20 GB of full-speed hotspot data; after that, hotspot speeds are throttled to a very low rate — often 600 kbps or lower — while on-device data continues at full speed.
When the hotspot allowance is exhausted, the tethered device may appear to connect to the hotspot but receives no usable internet access because the data rate is too low to complete requests.
How to identify this cause:
- Check your carrier app for remaining hotspot data. This figure is usually shown separately from your general data balance.
- If both phone and tethered device have had zero connectivity since a specific date in the billing cycle, that date may correspond to when the hotspot allowance ran out.
Fix:
Wait for the billing cycle to reset, or purchase a hotspot data add-on if your carrier offers one. Throttled hotspot data is a plan-level restriction — it cannot be resolved on the device.
Note on unlimited plans: A plan marketed as “unlimited data” may still apply a separate hotspot data cap. General device data and hotspot data are frequently tracked as separate allowances within the same plan, so exhausting hotspot data does not affect the phone’s own browsing or streaming.
For a breakdown of how quickly different activities consume hotspot data, see How Much Mobile Data Do You Need?.
Cause 3: Missing or Wrong Tethering APN
The APN (Access Point Name) governs how your device’s traffic is routed through the carrier’s network. On many carriers — particularly MVNOs — the APN configuration has a separate field for tethering or “Personal Hotspot” traffic in addition to the standard data APN. If this tethering APN is blank or incorrect, the phone’s data works normally, but tethered devices either get no internet or connect to the hotspot network without receiving an IP address from the carrier.
On iPhone:
- Go to Settings → Cellular → Cellular Data Network (or Settings → Mobile Data → Mobile Data Network on international builds).
- Locate the Personal Hotspot section at the bottom.
- Compare the APN field in that section to your carrier’s documented tethering APN.
If the Cellular Data Network menu is not visible, your carrier has locked APN editing through a carrier profile. Install the configuration profile from your carrier’s support page. See APN Setup Guide for iPhone for the full installation procedure.
On Android:
The path varies by manufacturer. On stock Android (Pixel): Settings → Network & Internet → Internet → [carrier name] → APN → [active APN], then check the Type field. A tethering-capable APN entry typically includes dun in the type list (e.g., default,dun). If there is no APN entry with the dun type, add one using the values from your carrier’s support page, or add dun to the type field of the existing APN.
On Samsung Galaxy: Settings → Connections → Mobile Networks → Access Point Names → [active APN], then look at the APN type field.
Why the DUN APN matters:
dun stands for Dial-Up Networking. It is the APN type that carriers use to route tethering traffic through a separate gateway or to apply the tethering data policy. When a carrier wants to track or throttle hotspot traffic separately from device traffic, they require tethered devices to use the DUN APN. If only the default type is configured, the carrier may block tethering traffic at the network edge.
Cause 4: Wrong Hotspot Password on the Client Device
This is the simplest cause and is worth checking early. If the tethered device entered an incorrect password, it may show “connected” or “obtaining IP address” indefinitely without completing the connection.
Fix:
- On the tethered device, forget the hotspot network: go to Wi-Fi settings, find the hotspot network name, and select “Forget” (iOS) or “Forget network” (Android/Windows/macOS).
- On the phone, go to hotspot settings and note the current password exactly, including capitalisation and any symbols.
- On the tethered device, reconnect to the hotspot and enter the password again carefully.
iPhone hotspot password location: Settings → Personal Hotspot → Wi-Fi Password.
Android hotspot password location: Settings → Network & Internet → Hotspot & tethering → Wi-Fi hotspot → [tap hotspot name or gear icon].
Changing the hotspot password: If you change the password after devices have already connected, all previously connected devices lose their connection and must reconnect using the new password. This is useful if you suspect an unknown device is using your hotspot and consuming data.
Cause 5: OS and Software Settings Blocking Connectivity
Even when the hotspot connection succeeds, software settings on either the phone or the tethered device can block internet access.
On the phone:
Check that Cellular Data is on: On iPhone, Settings → Cellular → Cellular Data must be toggled on (green). On Android, Settings → Network & Internet → Data usage → Mobile data must be on. A phone can share its Wi-Fi connection via hotspot even with mobile data off, resulting in the tethered device connecting to a network with no internet route.
Check that the correct SIM provides data on dual-SIM phones: On iPhone with two SIMs, Settings → Cellular → Cellular Data shows which line handles data. The hotspot shares only the active data SIM. If the wrong SIM is selected, and that SIM does not have an active data plan, the hotspot produces no internet access.
Check VPN on the phone: If a VPN app is running on the phone with a configuration that routes all tethered traffic, a VPN server outage or authentication failure can block tethered connectivity even though the phone itself still has internet. Disable the VPN temporarily to test.
On the tethered device:
Windows metered connection settings: A metered connection flag does not block internet access, but it causes Windows to defer automatic updates and some background sync — this is expected and not a fault.
Firewall or security software: Corporate security software on a laptop may block connections on networks classified as unknown or public. If the laptop connects successfully to other Wi-Fi networks but not the hotspot, check whether security software is interfering.
IP address not obtained: If the tethered device shows “connected” but “No Internet” or “Limited”, confirm it has received a valid IP address. On Windows: ipconfig in Command Prompt — the assigned address should be in the 172.20.x.x range (the typical hotspot subnet used by iOS) or a similar private range. If the address shows 169.254.x.x, the DHCP process failed. Toggling the hotspot off and on on the phone and reconnecting on the client usually resolves this.
Data Roaming required for travel SIMs: If you are using a travel SIM or travel eSIM and the phone itself has internet but the hotspot does not work, verify that Data Roaming is enabled for that SIM line. Travel eSIMs connect via a roaming session at the protocol layer; if Data Roaming is off, the tethering session cannot establish a data path even though the phone’s own traffic works through a cached session. On iPhone: Settings → Cellular → [travel SIM line] → Data Roaming (on). For a full diagnostic sequence when the phone itself shows no data, see No Mobile Data? How to Fix Data Connection Problems.
Cause 6: Device-Level Carrier Restrictions
Some phones sold by carriers are configured to block tethering, or to redirect tethering traffic to a carrier add-on purchase page, independently of the current plan. This configuration is applied at the device level by the carrier’s firmware profile, not at the network level.
Identifying device-level restrictions:
- The hotspot toggle turns on, but attempting to connect a device opens a browser page on the tethered device prompting you to add a tethering feature to your plan.
- This behaviour persists even when tethering is listed as included on your plan.
- The phone’s Personal Hotspot toggle is greyed out or hidden entirely, even though the carrier’s plan documentation states tethering is permitted.
Fix:
Contact the carrier to confirm tethering is provisioned for your account. In some cases, the carrier needs to send a provisioning message (a behind-the-scenes SMS or data update that re-enables the hotspot feature at the account level) or update the account settings on their end.
Unlocking the phone (SIM unlock) does not remove carrier-applied tethering restrictions, as these are typically enforced through the carrier’s APN-based detection methods at the network level rather than through the phone’s unlock status.
If the Personal Hotspot option is missing from Settings on iPhone, one additional step is to verify that Cellular Data is enabled and that the SIM is fully activated. iOS hides the Personal Hotspot option on some MVNO plans until a provisioning update from the carrier is received. Toggling Airplane Mode on and off, or rebooting the phone after contacting the carrier, allows the provisioning update to take effect.
Cause 7: How Carriers Detect Tethering — TTL and DPI
Understanding how carriers identify tethered traffic explains why some detection-based restrictions are difficult to bypass and why device-side changes alone cannot override network-level blocks.
Carriers use two primary detection methods:
TTL (Time To Live) inspection: Every IP packet includes a TTL field that decrements by one at each network hop. Your phone’s own packets reach the carrier at the phone’s default TTL (64 on iOS/Android). When you tether, the phone acts as a NAT router and decrements the tethered device’s packet TTL by 1 before forwarding it. If the tethered device starts at a different default TTL — for example, Windows uses 128 — its packets arrive at the carrier at 127, a value the carrier recognises as not originating from the phone itself. (Devices that also start at TTL 64, like macOS, arrive at 63 and may instead be identified by other signals such as User-Agent strings.) Carriers read these differences to identify tethered traffic.
DPI (Deep Packet Inspection) of User-Agent headers: HTTP/HTTPS traffic from desktop browsers includes User-Agent strings identifying the operating system (e.g., “Windows NT 10.0”). A carrier can identify that the request originated from a Windows device rather than the phone itself, even though the traffic flows through the phone.
If a carrier’s plan blocks tethering, the restriction is enforced at the network level using these signals. The phone’s own setting to enable hotspot is not the enforcement point — the enforcement is upstream at the carrier’s packet gateway.
This is informational context only. Whether to use methods that alter TTL or packet headers is a decision governed by your carrier’s terms of service; using any method to circumvent a carrier’s tethering restriction may be a breach of those terms.
Restart and Reset Steps
After checking causes 1–7, if tethering still does not work, these steps resolve many persistent issues caused by modem state and cached settings.
Step 1: Toggle Airplane Mode
On the phone, toggle Airplane Mode on, wait 10 seconds, then toggle it off. This forces the modem to re-establish the data session with fresh parameters. Wait 20–30 seconds for the cellular connection to restore before testing the hotspot.
Step 2: Restart the Phone
A full power cycle (power off completely, then power on) re-initialises the modem stack. This resolves stuck states that an Airplane Mode toggle does not.
Step 3: Reset Network Settings
If the above two steps do not resolve the issue and you have already confirmed the plan includes tethering and the APN values are correct, a network settings reset removes all APN customisations and prompts the carrier to push a fresh profile.
On iPhone: Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings. This clears Wi-Fi passwords, VPN configurations, and APN settings. eSIM profiles are preserved.
On Android (Pixel): Settings → System → Reset options → Reset Wi-Fi, mobile & Bluetooth.
On Samsung Galaxy: Settings → General management → Reset → Reset network settings.
After the reset, the carrier may automatically push a new APN profile when you reconnect to the cellular network. Test tethering again before manually entering APN settings. See How to Reset Network Settings (and What It Affects) for details on what each platform’s reset does and does not clear.
Checking Carrier Restrictions Before You Buy
If you rely on tethering regularly — for example, using a laptop at locations without Wi-Fi — verify tethering terms before purchasing a plan rather than after.
When reading a plan’s terms, look for:
- Is tethering explicitly permitted? Some plans prohibit it without mentioning restrictions in the marketing copy.
- Is there a separate hotspot data allowance? If so, what happens after the allowance is exhausted — complete block or speed throttle?
- Does tethering apply to roaming? International roaming plans frequently exclude tethering or apply a smaller separate allowance to hotspot use.
- Are there speed caps on tethered data? A plan described as “unlimited” may throttle hotspot data to a lower speed from the start.
If tethering is critical for your use case, select a plan where the full plan terms — not the marketing description — explicitly state tethering is included at the speed you need.
Plans that include a listed hotspot GB allowance are preferable to plans that mention tethering only in fine print or fair-use policies, because the allowance amount and post-cap behaviour are stated in advance.
Use SimFinder to compare plans, filter by tethering support, and check hotspot data allowances before committing to a plan.
Related Guides
- How Tethering Works and How to Set It Up — explains what tethering is, the three connection methods, and how to enable it on iPhone and Android, which provides useful context for diagnosing when it fails
- How Much Mobile Data Do You Need? — per-activity consumption figures for estimating how quickly a hotspot data cap will be reached
- APN Setup Guide for iPhone — full procedure for installing a carrier configuration profile or manually entering APN values, including the Personal Hotspot APN field
- No Mobile Data? How to Fix Data Connection Problems — the broader mobile data troubleshooting sequence for when the phone itself has no data, as distinct from hotspot-specific failures
- How to Reset Network Settings (and What It Affects) — detailed breakdown of what a network reset clears on iPhone, Pixel, and Samsung, and what is preserved