It is often worth your while keeping a functional
phone as backup, make sure it is unlocked from any network to allow
your family or friends to borrow your spare, or to guard against
future changes of network.Many high spec. phones have good
residual value and can be recycled for parts or re-sale with a number
of organisations. [See
moneysavingexpert.com for
links to best
value sites and instructions on getting the best returns on your
phone(s).] Here however we discuss the security implications of
disposing of your old phone, how to remove all private data and ensure
that your phone is worthless for anything other than it's hardware
retail value.