Default [Q] Unlocked & rooted Galaxy Stratosphere II i415 can't use SIMs in Canada

Hi, I previously used this phone in Argentina/Peru with multiple services. It's running 4.1.2. I returned to the US this summer & was back on Verizon. I arrived in Vancouver BC this week & have been unable to use SIMs from Bell, Rogers & Koodo. None of the three SIMs could access voice/SMS or data. Verizon assured me the phone should work abroad. Any suggestions?