O2 is launching a bundled offer of a four pack of Simplicity SIM cards. To be used with the operator's rolling contract of 30-day "Simplicity" tariffs, the four SIMs come with free unlimited O2 calls and O2 texts between them.

So the idea is the first customer can give the three other SIMs to friends and family which, once connected, means they can get in touch with each other for free.

There are three Simplicity tariffs available, 300 cross-net minutes and 600 anytime texts for £14.69, 600 cross-net minutes and 1200 anytime texts for £19.58 and 1200 cross-net minutes and 2400 anytime texts for £29.38.

Peter Rampling, marketing director at O2 said: "When times are tough, staying in touch with friends and family is even more important. This new proposition means that all calls and texts between four friends or family members are unlimited".

Customers can order up to four SIMs by sending a text to 66102 with their details or via a web link: www.o2.co.uk/ordermysim.