Checked with Samsung support and they suggest me to try with a different service provider (3g). My current provider says the existing settings seems to correct. Still I lose data connectivity often
I am yet to test with a different sim.
Sent from my GT-I9500 using xda app-developers app
Nokia 2100 - Nokia 3120 - HTC TyTN II - Moto CHARM - Galaxy S4 i9500
BB Playbook 16GB