It looks like my SIM / phone number has been hijacked how?

It's 2am and I can't sleep as I checked my mobile account to see I've spent £26 in SMS messages which I haven't. How the heck has someone managed to gain access to my number? Super stressed and can't sleep.

submitted by /u/DCzy7
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from hacking: security in practice https://ift.tt/3nY9ptJ