BSNL a telecom company provides 2G, 3G, 4G Internet to its consumer all over India. If you want to activate BSNL 4G network on your mobile phone then you have to do some changes to your mobile phone setting.
Please note that, If your mobile phone is a 3G mobile, then you cannot activate the 4G service on it. And you must have 4G supported BSNL sim also.
Activate Bsnl 4G Network On Your Mobile Phone.
After that 4G service will activate on your sim. Now, Do the below changes on your mobile phone by following the instruction.
If you Failed To Do These Setting Manually Then You Can Call BSNL Customer Care 1503.