How to manually select a Mobile Network in Samsung Galaxy Tab2 7.0(GT-P3100)?

c). Now , Tap on More under Wireless and Mobile Networks as shown below.

d). Now , Tap on Mobile Networks on the right side of the screen .

e). Under Mobile network , Tap on Network operators as shown below.

f). Under Available networks , Tap on Search networks. Your display will tell you if you have access to the network you've chosen.

NOTE: If you're out of range of the selected network, your device won't work.