So I recently topped £20 up a T-mobile Sims card. I use it to surf the web. (spend £2.5 for 5 days /£1 for a day)
When I buy a £2.5 booster, they normally sends out a message, saying that it has has been activated, and when the time is up, they send a message say its expired.
I gotta a little too busy the last few days, and forgot to renew those £2.5 internet booster. And haven't checked my balance, cos I assumed that when 5 days run out, they would let me know.
But the message never arrived, and just founf that I've been billed £1 for each of last 4 days. Its nothing really, but I just wished they had reminded me like usual...