Mobile contracts from EE, Vodafone, and Three combine the tariff and the cost of the device over a period of time and they continue to charge the same monthly fee long after the handset has been paid for.
O2, Virgin Media and Tesco Mobile have separate handset and other tariff costs.
For example, a contract with O2 Refresh for an iPhone 6 costing £49 a month, the handset part of the bill is £25 and the deal price will drop to £24 once the device has been paid for.
However, if you do a similar thing with Vodafone, costing £48.50 a month, the price doesn’t change once the contract period is up and the handset has already been paid in full.
We agree with Which? that all mobile phone operators should separate out the cost of the handset so people don’t continue to pay after the contract comes to an end.