I've had the same phone/contract for nearly 2 years now and it's only been in the last 2 months that my mobile web allowance seems to drain at a random point in the month instantly. I had it happen last month but figured perhaps I'd accidentally allowed some podcasts or something to download over it, but then just the other day I was out and in the span of 1 minute I got 3 texts saying my allowance was at 50%, 95% then 100%. My phone was in my pocket doing nothing at the time, and as far as I can tell nothing downloaded at all either. Anyone else come across a similar issue at all?
I'm using a Nokia Lumia 630 and my web allowance is 500mb which has been more than enough up until now!