I can't text or receive messages without Wi-Fi?

-i have an iphone 4s
-i had cellular data for a month and after that i can't text or receive messages
-it worked even before i had data.
- i already talked to tmobile

what is wrong?

So forget iMessage it won't work, You need monthly data or Wi-Fi to sens sms messages. You should be able to send plain text messages.

You are likely referring to iMessages. Text messages never has required internet (data/Wi-Fi) to receive or send.

Only your carrier can help in this case.

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