Telecoms regulator Ofcom has denounced fixed line phone price rises in the UK, showing conclusively how all major phone providers are lifting prices while the wholesale cost of the lines to them falls. And while it may not have the power to affect all the fixed lines in the market, it can at least apply a formula to the heavily regulated monopoly provider British Telecom and force its landline prices down by around £5 ($6.2) a month. It concludes that people who do not change providers regularly and those who only take a phone line from BT, and take video and broadband from someone else, are the worst affected, and that often means the most vulnerable customers – the very…