If you’ve got one of these:

…and the instruction manual can you tell me how to unlock the keypad please! 😳

Lift handset up and bang repeatedly on a hard object, works every time.

Strange – a quick look at the product features says:

Keypad Lock No

Borked?

Bearing in mind this cost around a fiver, that is a very silly suggestion.
Are you an engineer by chance? If you were IT and said take the batteries out… hang on……

Well theres a key type thing on the display and every button pressed gets the same beep. Phone says no.

complete guess… try pressing and holding down the hash key, and if that don’t work do it with the star key..

MartynS – you sir are a genius. Hash key it was. Thankyou.