At Which?, we receive a lot of complaints about a lot of companies. From poor customer service to no service, faulty products and broken promises, we see it all. Here's what some of our members had to say about BT. Read more about BT Broadband

With the Olympics upon us, London is bracing for transport chaos as the Tube strains under the heaviest passenger numbers in its history. If you're delayed while travelling on the Underground, follow these simple tips for claiming a refund on your journey. Read more about claiming for your Tube journey

Choosing a mobile phone for a teenager's Christmas present? So is our mystery shopper - find out whether the network operators were able to give out any wise advice. Read more about T-Mobile's customer service

Rather than brave the high street our mystery shopper decided to call up the networks to see what they could recommend as a Christmas present for a teenaged relative. Read more about O2's customer service

With Christmas getting closer our mystery shopper is in need of a present for a teenage relative, so they called up the networks for some mobile phone related ideas. Read more about Orange's customer service

Faced with buying a mobile phone as a Christmas present for a teenaged relative, our mystery shopper turned to the network operators for advice. Read more about Tesco Mobile's customer service

To ensure Santa delivers the right mobile phone to their teenaged relative, our mystery shopper called up the network operators to find out which is the best one to buy. Read more about Vodafone's customer service

Getting advice on what's the best phone to buy a teenager for Christmas is a tricky one so our mystery caller phoned up the network operators to put their reps through their paces. Read more about Virgin Mobile's customer service

In an attempt to get organised our mystery shopper has decided to do their Christmas shopping early and first on the list is a mobile phone for a nephew. How much help will the network operators be in finding the right device? Read more about 3's customer service

Buying a teenager a mobile phone for Christmas can be a minefield - how much help could the network operators offer us in our quest for the perfect gift? Read more about Talk mobile's customer service