Question: ncell how to activate 4g?
Answer: First, you need to check if your SIM supports 4G or not. For that, you need to send a message q to 324. ... 
You also need to dial *324# to get the 4G offer mentioned below.
Then your handset shall also support 4G. ... 
Then you have to put your phone in 4G preferred mode in settings, mobile network.