I've found that most ports have internet cafe's or spots with free wi fi. I'm not sure if any calling plans include AK, but on caribbean cruises PR
and the USVI's are included in my calling plan. If you need email or internet, by purchasing the ship's package you know up front what the cost will be.
Most plans don't charge much for text messaging, but only if you can keep it to a minimum.
Your cell phone provider can give you pricing for various plans if you ask.