I have same problem, just today my suncellular sim data service has stopped working, I tried everything I found on the web but nothing worked, turning on/off of data doesn't show the data connection (H+ sign), but GSM is okay, i can receive texts and calls, my settings for data are all correct 100% sure, APN, roaming on, data set to sim but still there is no data connection showing..
I know it's possible that the network blocked my sim, because recently my sim got free data connection on any sites (P0 load), including play store, torrents, youtube, etc, free as in everything.
So pals, is there a way to get my data service work again? Thanks