Fraudsters draining accounts with ‘SIM swaps’ – what to do

From Sophos Naked Security:

Fraudsters draining accounts with ‘SIM swaps’ – what to do

"Have you ever lost your mobile phone?

If so, you already know that your mobile provider will happily sell you a new phone and give you a brand new SIM card to activate the handset.

Lo and behold, when you fire up the new phone, it has your old number, so you don’t need to give all your friends and colleagues a new one."