Straight talk iphone can't send iMessages or use data without Wi-Fi?

My mom and I recently upgraded phones, and her current phone is my old one, whenever I got my new one they took my SIM card and put it in my new phone, and her old phone didn't have a SIM, so the phone she got didn't per say have a SIM card to be put in, So without this SIM card she can't use her data on her iPhone or send iMessages without Wi-Fi. And the service people say it absolutely isn't because there isn't a SIM, so what is the problem? Could anyone please explain.

What did they say the problem is?

Can your mom talk on her phone? If so then her service is working and she has a SIM card. It's possible they put a new sims card in her phone when they took urs out.

What kind of plan does she have? It could be a plan that doesn't allow sms or data. I've had those plans before that offered only minutes.

And it could be her phone that's messing up.

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