will a telus sim card work on my unlocked iphone 3gs?

If your mobile is unlocked then you can insert any network in the phone.

varun said:

I have an iphone 3gs that WAS locked to rogers, and now its unlocked. will getting a new telus sim card work on it?

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Once the phone is unlocked it can be used with other GSM networks. Recently, I used the permanent unlock service from Theunlockarena.com to unlock my iPhone 3GS after which I was able to swap to other GSM networks easily.