What's costing me money on my Iphone?

It's starting to worry me now - randomly around once a week I loose around 20 p of my credit (I know this because I've started to check it reguarly). At the start of the this week I was at £1.90 - I have made only one call - And tonight I'm at £1.72. I have turned off my Wi-Fi almost full time now, data roaming, mobile etc is off. I even turned 3g off for a while. I haven't been on the internet, although i did go on my own Wi-Fi for instagram (for like 10 mins). All my apps are free, i have temple run, fruit ninja, etc. I just go i06, but lost most my money before that. I don't get it? It's just random. Should i delete all my apps? I did once get the spotfity (free) app, but deleted it because i found it charged per month; did i not fully delete or something?

You would be surprised at how many dormant apps eat data… I assume you mean data.

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