O2

If you have an issue with your O2 things, just go there — this store is one of the few branches where staff are competent, helpful and friendly. They helped me out more than once!
I guess, we all have made our mixed experience with telecom companies. Dealing with support lines etc. was for me often a source of frustration and I try to avoid it.
As it happened, I replaced my iPad with a brand new iPad Air. Unfortunately, Apple had decided to change the size of the SIM card, so I could not just continue using my existing SIM I bought at the Apple Store about two years ago with a tariff specifically for the iPad. After the online support chat was not too helpful, I walked into the O2 shop on Putney High Street. I should have known better. Once again, the customer service was appalling — they went so far to say that what I was asking for was not possible. And asking the customer to do the registration of the new Nano SIM on their own mobile phone, that does not even support Nano SIMs, is not really a clever move.
Because I had similar experiences at the Fulham Broadway and the Putney High Street branches before, I decided to give O2 a last chance and the next Saturday, I walked down to the O2 shop at 134 Oxford Street. In the past, they were always friendly and competent.
And once again, the customer service at this particular O2 branch was great. The guy was very friendly and efficient, he knew what he was doing, he was explaining the options and sorted everything out for me. Thanks only to him, I continue to use my O2 SIM with the iPad Air.
It is really surprising, that mobile phone companies make it more difficult for customers to stay, than to change…

The person who helped me at this store took care of business and got me out of there in 2 minutes. It was exactly what I needed to happen. I love when people understand urgency!