This long, rectangular phone was a branded device for Peoples Phone (a UK mobile phone service provider and retailer).
The screen displayed 2 lines of 8 characters, a battery charge icon and a signal strength indicator. In addition to the standard 12-key keypad, it provided 9 function keys. These were OK/MENU for accessing the secondary features, RECALL/STORE for managing the address book, ALPHA for entering characters instead of numbers, MUTE for switching the microphone off, CLR for deleting the last character typed, SND for dialling a call, END for terminating a call and two up/down arrow keys for scrolling through menus.
The address book could store up to 99 telephone numbers with associated names with full numeric or character search capability and speed dial access. In addition, it provided a range of timers for monitoring the duration of calls.
The Mobile Phone Museum team believes this device was manufactured by Panasonic.
Some information courtesy of Nigel Linge & Andy Sutton, the authors of 30 Years of Mobile Phones in the UK (Paid Link)