Start with the simple checks. Change one thing at a time so you can tell which step helped.
Carrier settings, mobile data, Wi-Fi/Bluetooth state or a device limit may prevent hotspot sharing. First, note what changed recently and whether the same issue affects another device. This helps separate a device-specific fault from a wider network or service issue.
Troubleshooting steps
Check the basics
Confirm mobile data works on the iPhone and the carrier plan supports hotspot use. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Review the settings
Turn Personal Hotspot on and keep the settings screen open while the other device connects. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Test one change
Restart both devices and try Wi-Fi, Bluetooth or USB according to their support. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Confirm the result
Check the hotspot password and remove an old saved network profile on the joining device. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Helpful note
Carrier fees and limits vary; check your plan before using a hotspot extensively.
When to get more help
If these checks do not resolve the issue, contact the relevant device maker, internet provider or app support team. Include the exact model, software version, any error message, what you have already tried and when the problem began. Avoid sharing passwords, verification codes or private account details in a public forum.
For equipment that is hot, damaged, wet or making unusual electrical sounds, stop using it and seek qualified support. Do not open power supplies, batteries or mains-powered equipment.
Settings and menu names vary by model and software version. Use the manufacturer's current instructions for device-specific steps, and back up important files before making changes that could remove data.