How To Setup Tunerless Dvr With Satellite And Cable Out Of Wall How To Setup Data Network On Used 1st Gen Iphone?

How to setup data network on used 1st gen iphone? - how to setup tunerless dvr with satellite and cable out of wall

I have iPhone 8GB 1st Gene appears. Is there a way to configure Internet access? I get the message "Could not activate cellular data network." I have the Media Max bundle with ATT unlimited data. In theory it should work with the correct settings. If you have any idea how to do this? Everything else works on the phone is synced with my data.