Moped and e-bike phone snatching
Central London, especially Westminster and CamdenVery commonA rider mounts the pavement or reaches from the road and takes the phone from your hand while you are walking, navigating or on a call. It is over in under a second.
How to avoid it: Do not walk near the kerb with your phone out. Enable a stolen device lock and note your IMEI. Do not chase.
Sources Metropolitan Police theft prevention r/london phone theft threads