I have had a problem with people getting busy signals when they are trying to call me occasionally, has anyone else had this problem and if so is there anything I can do about it? Would reseting the phone work? And would anyone know where I can find the OS 4.1 upgrade for my 7100g and does it make a difference, by the way Im on Rogers.

go here and load the version for the 7100g it will work fine its just updated and stuff
4.1 CSL
and then go here and install the zen theme, i did it ota from the blackberrys browser and it worked fine for me, the zen theme is so much better than any that your tmo comes with -Zen theme and just another helpful tip when you want to get ringtones go here
Ringtones

as far as the busy signals go i dont know!

Thanks, I actually reset it and it answers calls quicker now. This may be a stupid question but will upgrading to 4.1 affect the phone anyway negatively being that Im on Rogers?

should affect it in a good way, more speed dial entries and things like that