Flashed iphone to cricket mms and internet not working?

Ok so my friend got his iphone flashed with cricket. But then he turned it off and he still had texting and calling but his mms doesn't work or his internet. I have cydia on my iphone and when he was looking through my phone he said oh thats the app i need… So i told him i would put it in his phone. My question is just by downloading cydia into his phone will he have mms and internet again or what else do i have to download and also will this erase his calls and texting cause i don't want to mess his phone even more?

No cydia doesn't do anything to a iphone, you will need a smartphone data plan and turn cellulr network on in settings.

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