Hi, it's possible something has altered your App settings, I suggest you go to the Sprint website and get the APN settings and check them against the ones on your phone. Phil

 

Double check you netywork settings. More Networks/Mobile Networks

Make sure your mobile data is check marked and I always use my connections optimizer too. For some reason these have both been uinchecked for no reason on my phone before?

Bear

 

also check setting/about device/status and see what it says for mobile network state:

if it does not say connected, then what philayl said could be correct, something to do with apn etc.. not a hard fix but not something the average user is aware of