No network in my sim

I want to upgrade my sim to 4G network

There's no network on my sim card. I'm out of the country presently. What do I do to resolve this?

My phone number is 07030007177 and is not bringing network up, what do i need to do please

My MTN network recently started going off. It might go off for a week and come back on for 30 minutes and go again. It's been like that for a month now. I recharge the SIM often...