Here's a quick step by step guide on how to configure your Android phone for browsing on any network.
Steps:
1. Go to settings > more > mobile networks > access point names.
2. Under access point names, you'll see a list of the SIM card(s) in your phone.
3. Click the desired network you want to configure your phone to browse with.
4. You'll see a list of created APNs.
5. If the desired APN isn't listed then press menu and click create.
MTN
APN : web.gprs.mtnnigeria.net
Username: web
Password: Web