The more powerful the transmitter in your cellphone, the
better it will be in giving you coverage in remote areas.
Hand portable phones are Class 4 devices (as defined by
the DTI) and offer maximum output of 2 Watts (although this
is usually limited to 0.6 Watts). Carphones and transportables
are usually Class 2 devices offering a maximum signal output
of 8 Watts.
Each cellular phone is assigned a unique ESN, which is
automatically transmitted to the cellular tower station
every time a cellular call is placed.
Extended Total Access Communications System. The standard
used by UK analogue cellphones. Originally termed TACS,
additional frequencies were added to increase network
European Telecommunications Standards Institute. The people
who wrote the specification for GSM and DECT.