I would like to make some things clear as there's been many discussions on so many forums about this but no definite answer. Things I know: 1) If you buy a iPhone 4S from Rogers or Fido, Prior to activation it is "Network unlocked between Rogers and Fido" meaning you can either activate it with Rogers or Fido (not with any other sim as some people claim and scam or lie about) 2) Yes Rogers and Fido is owned by Rogers in general but they so far were still sparate networks to date except I think in the past almost a year they have been migrating to one because fido employees are now getting discounts on Rogers products/services (Internet, Landline, Cell Phone) 3) I know that iPhone 4S from Rogers works 100% on Chatr Wireless because Chatr is from day one pretty much a MVNO much like Straight talk, H2O and Red Rocket is for AT&T. 4) I can call them and Yes as many have already told on many different forums.....the CS Rep's are usually clueless or deny any claims of such possibility. 5) Yes I can also go spend $10-$15 to activate a new prepaid Fido sim just to go find out...but its not really worth spend that money plus going over to a fido store which is about 15km's from me. Things I don't know and would like to find out: 1) If the iPhone 4S purchased in the past 3-4months has been activated on Rogers Wireless network will it work on Fido with a Fido SIM to be specific? Please only reply if you have successfully done this ONLY WITH A iPHONE 4S....I don't care much to know about iPhone 4 (yes they are very similar but it matters trust me...) 2) Does a Fido Activated (this doesn't count if the iPhone 4S was never activated before) iPhone 4S work on Rogers...? 3) Does a Fido Activated iPhone 4S work on Chatr Wireless? I would like to request that members only respond if they have personally tried this and can confirm 100%. Otherwise please refrain from commenting Thanks. Also thank you to those that can provide feedback in advance, I'm sure this thread will be helpful to many many people even in the future as this question always has been somewhat un-answered.