Hi yes sidekick is also one among best phones ...Before purchasing phone you must first check that whether the sidekick phone is locked or unlocked one .If the phone is unlocked one then you can freely use it with telus or any other GSM sim .Else if the phone is locked to some other network provider then until you unlock your phone you can't freely use it with any GSM sim .You can easily unlock your sidekick mobile using sites like SimpleUnlocking.com they are providing unlock code for all mobile models at reliable cost .....