Terrible operator my misses had awful trouble.
If you're on Android you can set your phone to stop using mobile data after a set amount. Not sure about iPhone.
I already have this deal from a few months back. Can confirm it is most excellent.
Avoid at any cost and find a decent provider. If hell existed it would be similar to dealing with their customer service. It took them 3 months to put through a cancellation request and another year to stop emailing me bills. I had to spend hours waiting on the phone every time I called them and they were pretty much useless. Nightmare. Save your money, time and effort.
It's a 30 day rolling. If you don't like them leave them?! Been with them over a year, just a fact, not offering an opinion on them. I've 1000 mins 1000 SMS and 1GB data at £3.99 a month I don't make calls when I'm abroad, if I'm desperate, maybe find somewhere with WiFi and make do with that. If there's anything cheaper, I might consider it. I think it's one of "them" deals