of the surveys have been audited externally. Each operators
figures are statistically valid at the national level to approximately
+ or 0.5% at a 95% confidence interval. As recommended
by the auditor, the results have been rounded to one decimal
made to and from mobiles connected to the automatic call generating
equipment and dedicated fixed test lines: mobile to fixed telephone
line and fixed telephone line to mobile, in the ratio of 2:1.
regarded as successful if held for two minutes.
quoted only reflect the service experienced on the specified
routes, at the time of day that the calls were made and the
type of handset used.
operators use different test equipment and different signal
frequencies and so adjustments have been made to try to compensate
for these differences.
Vodafones dual band capability nor BT Cellnet and Vodafones
analogue network were tested as part of this survey. BT Cellnets
dual band capability was tested as part of the survey. For further
information about dual band networks please contact BT Cellnet
or Vodafone at the addresses shown below.
and Regional Data
for all mobile phone networks are presented on a national and
regional basis. The UK has been divided into nine areas: London,
South East England, South West England, East Anglia, Midlands,
Northern England, Wales, Scotland, and Northern Ireland(1).
together with OFTEL and consumer groups are currently working
to further improve the methodology, comparability and accuracy
of the survey approach used.
of subsequent surveys are due to be published every six months.
wanting further information about the survey should contact
the mobile phone network operators directly.
above, although the results have been independently audited,
the survey was carried out by the four mobile network operators
according to their own agreed criteria. Therefore OFTEL accepts
no liability in respect of any of the results.
One2One did not survey Northern Ireland due to having no commercially
available network within the region during the time of the survey.