Someone I know on FB had her phone nicked out of her pocket and so had to wait until she got to a computer to lock out all her various social media items on there.
I mean I know most of you aren’t on Facebook or Twitter or Instagram but you probably have an email account on your phone.
(I recall doing this thread on the old forum and loads of you were pretty relaxed about perfect strangers being able to access all your data from your phone.)
Also worth keeping a note of your phone’s IMEI number if it’s not via contract as you might need it to get the phone fully cancelled, I think.