GPRS is a data connection it can go up to a 100k sec and that is more than enough for this. Txt's for some (economic) reason are considered separately! some top up sims require topping up every 6 months some are every 12 months as the "credit" expires! check in advance so it works when you need it!

VODAPHONE have had data only tariffs for more than a decade! - some of the kit I use for work use them!