Iphone message: could not activate cellular data network?

Every time i go to send a text with my iphon3 3g a litte bubble pops up and sais "can't connect to cellular data network… I know that i do not have a data plan… It did not do this before but i lent it to my girlfriend for a day and god knows what she did to it… I turned off all of the data settings and even reset all of the network settings… I can still call and text just fine it is just annoying that it pops up every time i open up sms

also i do not have any kind of an internet plan and i do use Wi-Fi but i'm not connected atm. I'm at sschool and it does this all the time even when i'm connected to Wi-Fi it still pops up as soon as i open up my texts…

Its having a hard time picking up the cell tower in that area, the school walls are probably thick so that doesn't help. Its an old Iphone and there's a 4g network now. Also the network settings may have to be reset by your provider. Man it could be anything at this point. Iphone sucks and thats the biggest problem, go android. Ill never get another iphone.

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