I have searched the forum and internet for a few hours but found nothing related to Tesco GS4 roms! : I used the 02 4.3 one from here and then update via keys to 4.4.2 -
Tesco and o2 share the same network, but they probably have different access point settings. if you go to the tescomobile website or call support they should be able to send you some settings to ensure you have the right APN?
Are you connected to TESCO (it says TESCO in the carrier label when you pull down notifications?) Just also check that in "settings/more networks/mobile networks/access point names" that it relates to tesco and not to o2?
|galaxy s4 4.4.2, kitkat 4.4.2, kitkat update|