Thanks. Yes, I did check out the OP. Global APN keeps crashing/freezing on my device. No luck with that.
Method 2: I'm not good at ADB. Can I just change the APN from with Root Explorer as a text file by adding the Bell APNs?
Easiest bet is to copy that file in root explorer to your sdcard and edit it on a computer when you get a chance. You could do it on root explorer, but it will take a little while.
Be sure to copy the original as well and save it as a .bak or something in the same folder before you replace with a modified version.