I bought a new samsung s7 to replace my old samsung s5. I have been told by the seller that the s7 is unlocked. I have put my old s5 SIM in the s7 but for an unknown reasons I cannot get signal at all. The SIM works perfectly with the s5.
I have been getting the following messages:
1. When I select search network operators and click 02-UK. The following words appear on the phone:
NO SERVICE. Selected network (02- UK) not available. The signal in my area is very good.
2. When I try to make a call the following words will appear on the phone: PHONE NOT REGISTERED ON NETWORK.
But the SIM works perfectly with the s5. .
Please I need urgent help. Thank you,