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Hi, I have an iPhone 4 on Telus and my dad has an iPhone 4 on Rogers. We have both tethered out devices while on trips with no wifi an on other occasions and have never been warned or limited of oyour tethering usage.
So as far as Telus and Rogers cares provided your within your monthly limit of data you can do as you want. And if you go over more money to them so they don't mind 😛