Hey guys.
After updating to iOS 4.2.1 on iPhone 3G and MTN carrier settings 9.1 I noticed that my "Internet Tethering" option disappeared from Settings -> General -> Network.
The "Mobile Data Network" option was however still there and I edited my APN from "internet" to "mymtn" (username = blank, password = . This somehow brings the tethering option back.
Not sure if this is a fix but it worked for me.
Hope it helps someone oneday
Merry Christmas to all
