Woah !!! I really don't know what I did...but it works now! I don't know if any of the steps I did helped or not, but here is what I did. After I reflashed, it still didn't work. Also, when I enabled 3G, I just didn't see any carrier available. So I disabled 3G, unabled Roaming and cellular data, then I went in the carriers' list and selected "Bell". When a check mark appeared, I quickly went and enabled 3G before I got the Network Lost message and I went back in the carriers' list. Bell 3G appeared. I selected it, then the Network Lost message appeared...but I had network. For now I have tested sms and calls which are both working. I will be making more tests to make sure everything is working, but looks good so far!
Thanks a lot for your support ;) !!
Edit: I still have issues with wifi though, which is quite annoying...
Dubious about wifi errors -- it really could be a dying baseband chip. Thanks for posting to let us know you got it working to begin with, sorry I don't have any suggestions as to how to fix the WiFi... You don't have any carrier profiles hanging around from earlier iOS revisions do you?
I realized that wifi is working quite well except on cydia, where it always disconnect every 10 sec. So now that I have everything I need off of cydia, wifi is working 98% of the time so far...not too bad.
Worth mention that at present, Cydia's repos are mostly all tanked from excessive load -- are you sure it's not just timing out and dying because the servers aren't responding? Do you actually see the WiFi logo disappear while you're running a Cydia update?
Sorry, I was away for awhile. But yes, I'm sure it's the wifi. The logo is disappearing and it's asking me to enter my wifi password again (it forgets it...). Anyways it's not that bad...
Originally Posted by n1ckn4m3