I've had my samsung galaxy s4 i9505 on the talktalk carrier for months now and had no problems accessing the internet. However, since flashing CM12.1 on my phone I have not been able to access the internet using any internet browser using my mobile data. I can however, go on gmail, play store, flipboard, use my phone as a portable hotspot etc. etc. Could anyone please help me get internet connection back. Thanks.