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Here's a newbie question on using the Canada-US-Mexico plans.  Should roaming be turned on or off upon arrival in the US or Mexico?

I'm thinking of switching to a more costly plan and am wondering about what happens to the payment that I have made for the current billing cycle. If I change plans before the end of the billing cycle, is a pro rata credit for whatever is left of the...

I purchased the US Roaming with 3GB data Add-on this morning. I’m now in the US and have able send and receive texts, but calls to Canada are failing. I’m using an iPhone 6s with the latest iOS. Roaming is turned on and I have 5 bars on the T-Mobile ...