We had a seperate US cell phone for the last 3 years, a prepaid plan with AT&T. Like you we didn't need a data plan, so we would buy a $100 prepaid card that had an expiry date of 1 year down the road. With their prepaid we chose the $2 a day option, which meant we had a $2 charge against our $100 credit, but only for the days you use it. That $2 gave you unlimited texts for that day as well as unlimited calls within USA. Now we are not snowbirds but we live within 50 miles of the border so we spend alot of time in the US, both with our trailer in summer as well as occasional trips down in winter for a few days.
In our case it was no longer worth maintaining that US plan since our Rogers plan in Canada came out with a "Roam like Home feature" that charges $5 a day whenever we use our phone in the US, and we can use it just like we would at home. No roaming charges, just the $5 a day to a maximum of $50 per billing cycle. Now I see that Bell offers that same feature, as well as Fido and others as well.
In your case as a snowbird, a prepaid plan that you pick up once you are down there may prove to be a good option.
Rogers also has an international plan that you pay more for monthly but can use it as much as you like in the US.
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