While roaming, data service works a little differently and has some restrictions.
T-Mobile is always looking for ways to offer as much coverage as possible on our own network, so we must sometimes rely on domestic roaming partners to broaden our domestic coverage.
If your i Phone says “No Service”, you can’t make or receive phone calls, send text messages, or connect to the internet unless you’re using Wi-Fi.
It’s easy to forget how integral our i Phones have become in our lives – until they don’t work.
In many cases you will not be able to reach the help desk using a toll free number while traveling internationally and will need to email for assistance.
Or better yet, ask the help desk for an international number so you can reach them by phone once necessary.
For example: should a subscriber travel beyond their cell phone company's transmitter range, their cell phone would automatically hop onto another phone company's service, if available.
You can manually select a network only in areas where T-Mobile does not own GSM spectrum.
If you still can't connect to a cellular network, and have confirmed with your carrier that there isn't an issue with your account or network, try restoring your device.
Only your wireless carrier can access and manage details about your account.
If you’re on top of a mountain, you wish to return to society before you continue.
If you’re not, let’s stop your i Phone from saying No Service for good.