Start with the simple checks. Change one thing at a time so you can tell which step helped.
The carrier may restrict tethering, or the joining device may not support the selected hotspot band. 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 and check your carrier plan for tethering support. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Review the settings
Review the hotspot name, password and allowed-device setting in Android settings. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Test one change
Try the compatibility or 2.4 GHz band option if older devices cannot see the hotspot. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Confirm the result
Restart both devices and reconnect after removing any saved incorrect hotspot profile. After each change, repeat the action that originally failed and give the device a moment to reconnect or refresh.
Helpful note
Hotspot menu names differ by Android version and manufacturer.
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.