There is a new kind of mobile phone scam. A missed call will show on your mobile phone starting with 090. The last four numbers may vary, but the first four numbers will remain the same. If you call this number back, you will be charged between £1 and £15 per minute. This was previously legal, although ICSTIS (the premium rate telephone number regulators) are clamping down on this. So don’t call back any number beginning with 090.

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(Thanks to for the additional info)