My iPhone suddenly isn't receiving texts?

I just went on a trip to Europe. When I was there I was able to receive texts and send them just fine. Suddenly on my way home (in the airport) I was texting my friend and it said my text failed. I'm home now (where I always have good signal) and I can't receive or send any texts. What should I do? I tried turning it on and off, a hard reset and putting it on airplane mode then back to regular.

I have an iPhone 3GS if that makes any difference.

Call the company your with or take it in they usually have an answer, also maybe you messed with an incoming/outgoing setting? Maybe you should Check

When my iPhone did this I took it to the apple store and all they did was restore it but it works now anyways

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