Using MTN you can use free net via mms accespoint
Use app. Below to hack mms
MMS HACKER BY HQ.RAY
then create the following acc. Point
Name: mms
data bearer:gprs
acc. Point:mms.mtn.com.af
username:mmsmtn
password:74412
Autnec. :secure
homepage:http://mtn.com.af/?=free