This calculator allows you to compare up to three mobile phone tariff structures - play around with your estimated monthly peak/off-peak usage - the calculator automatically amends these estimates for tariffs 2 and 3. Note that the costs should all be exclusive of VAT.

Key

Peak usage
Your estimated monthly peak time phone usage in hours.
Off-peak usage
Your estimated monthly off-peak time phone usage in hours.
Free call allowance (£)
Some air-time suppliers provide a monthly free call allowance in money terms.
Free peak time (hours)
Some air-time suppliers provide a monthly free peak call time allowance.
Free off-peak time (hours)
Some air-time suppliers provide a monthly off-free peak call time allowance.