The NEC P3 became available on UK mobile phone networks in 1990, retailing for £500 (with a contract).
NEC claimed the P3 was the first truly personal pocket phone being small, reasonably light (compared to other phones at the time) and with good battery life.
It succeeded the
NEC 9A, being smaller thanks to a reduction in the internal circuitry and battery size but offering improved performance. The battery offered longer talk and standby times, the address book was extended to store up to 99 telephone numbers and associated names and it had a built in clock with an alarm feature.
Some information courtesy of Nigel Linge & Andy Sutton, the authors of 30 Years of Mobile Phones in the UK (Paid Link)