Airtel is very reliable and provides network at the most unexpected places, I love Airtel and I have been using it for years . Airtel is the best.
Glo is really cheap, the data price is so cheap, but the network is bad and really annoying.
I have an MTN sim, I hardly use it, because Airtel is always available and reliable.
Wow..like I said, it all depends on ones location ..Airtel hadn't been serving me better than MTN