My iPhone 5s won't let me use data when I'm on the phone why?

I just got my phone and it's sprint and for some reason won't let me use my data while I'm on the phone help what do I do I tried to call the store but close I need to know now

It's not a problem with the phone, but a question of which kind of base station/network you're connected to at the moment:

- 2G(GSM) simply can't support simultaneous voice and data connections
- 3G(UMTS) and 4G(LTE) support simultaneous voice and data connections in principle, but depending on the load in the cell may chose not to permit them

What you can do? Nothing much. Find a provider with a better 3G or 4G coverage at your place.

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