If the cell phone is locked to Rogers network, you can use any Rogers SIM card with it. If you want to use any other GSM network SIM card with it, it has to be unlocked in prior. You can unlock a cell phone safer and easier using unlock code. You can get the accurate unlock code either from the respective network provider or from any trusted online vendors like MobileUnlockSolutions.com at affordable cost with an easy unlocking guide. Good luck.