As many as 18 phones are believed to have been pickpocketed in a Newcastle-under-Lyme bar over the weekend (2 and 3 November).
Staffordshire Police have received five reports of stolen phones and have heard of a further 13 incidents.
Nearly all of the phones were taken from pockets and handbags in and around The Kiln craft bar on the High Street.
Police in Newcastle are appealing for anyone who had their phone stolen while in the town last weekend to get in touch.
PC Todd Young, neighbourhood officer for Newcastle Town Centre, said: “We are actively investigating reports of phones being stolen, but we need the fullest picture to help us string together the movement of those involved. If you are a victim of phone theft, please contact 101 immediately.
“To help prevent you being a victim of phone theft, remember you can register your phone on immobilise.com to stop someone else taking ownership of the phone if it is ever lost or stolen.”
To help improve the chances of recovering a stolen phone, the IMEI number of the lost device can help.
The IMEI number can be found on the box the phone came in or can be obtained from your network provider.
A description of the phone, including any unique characteristics like phone case and your home screen background image, would also help in recovering the device.
If you were a victim of phone theft or have information about the incidents over the weekend please contact 101 quoting incident number 212 of 3 November.