Balance went from £15 to £13 after topup.

[add1ct]

After topped up my new sim with £15 to buy a £15 tariff I was instantly charged(?) for £2.

[pgn]

Had you perhaps sent 3 x SMS messages with emojis or pictures or similar attached? These are called MMS, discussed here: Guide: Accidental MMS Sending and How to Avoid it and are chargeable.

Other out of tariff charges may have been an SMS or call to a non-UK number, @add1ct - but to find out for sure, you will need to call O2, 4445 from your phone or via Social Media at the link just below. Good luck!

[add1ct]

Thanks for your reply. No, my SIM wasnt even activated before. I just topped up with £15 for the first time, and when I went back to the O2 app (after 20 mins) to check if its active yet or not, I noticed my balance is only £13. 

I will probably call them. Thanks pgn

[MI5 · Accepted solution]

@add1ct 

£2.00 is the daily charge for data when you don’t have an active bundle. 

[add1ct]

Yes, you are right. I just found out that it was the daily charge for data (even tho I wasnt use my phone). So tricky.