Tracfone - $100 each year add minutes and unused roll over. Not the best phone by any means but suits us for how little actual phone calls we generally make. In fact we are thinking that in the near future we might end up disposing of this altogether but have had it since 2009 and have racked up a lot of minutes with all the roll overs, so reluctant to lose them! LOL.
Bell Mobility - Travel add on for unlimited text $20/mth and small amount of talk, and sometimes will add a data add on for another $20/mth I think 200mb, but just enough for very odd time can't connect to wifi set up.
In preparation for going FT we purchased a Verizon MIFI pay as you go on sale Best Buy at less than half price US$21 last December. Haven't used it yet, but have read a lot of snowbirds when Millenicom saw it's demise, went this route, with Verizon whilst being one of the more expensive ones, has typically the most coverage.
Some Folks use T-Mobile with Binge on we've been reading, but their service coverage we've experienced when Bell has had us roam on them in Fla has been non-existent at times even in populated areas, so we are very skeptical. Roam Mobility is basically T-Mobile from Canada without the binge on, so I'd go direct T-Mobile if you were to consider that = just saying FWIW is our thoughts in that regards, but do your own assessment.
If you absolutely have to have coverage almost consistently, and there's never any guarantees with cellular style internet, many seem to carry a mixed arsenal of AT&T, Verizon and for unlimited when available T-Mobile is what we've been reading from many.
For the most up to date, I'd visit Technomadias Mobile Internet site as they seem to be on the latest pulse of best options for Data.