11. Ending this agreement
a) Either you or us may end this agreement by giving the other 30 days’ notice in writing. Your notice must include your mobile number and the signature or appropriate security details of the account holder. You must pay the charges during the notice period.
b) You may end this agreement by writing to us if:
- we don’t do something fundamental that we should have done under this agreement (for example, if there is a complete failure of the network for 7 days in a row due to something we have done), within 7 days of you asking us in writing;
- we tell you that there will be an increase in the line-rental charge by more than the increase in the retail price index (worked out as a percentage) since the last line-rental increase and you write to us before the increase applies;
- we increase your charges in the UK which have the effect of increasing your total charges (based on your usage in the previous month) by more than 10% and you write to us before the increase applies; or
- we change this agreement to your significant disadvantage including changing or withdrawing services (we will tell you if this is the case) and you write to us within one month of us telling you about the change. This does not apply if the change or withdrawal relates to services which you can cancel without us ending this agreement.