It is increasingly important to understand that in this ever advancing Technological age, the ability of the person called to recognise that the person calling them is NOT calling from outside the UK has been made easier.

When companies like Alliance & Leicester can refuse to accept your calls for this reason, we have to look at ways of preventing them from capturing your number (not to mention the obvious rebuttal).

Therefore to block your number, it is recommended that you must

remember to prefix the number called with
141