I recently found that my T-Mobile phone had stopped switching to Orange when I was out of reach of a T-Mobile signal. I went to a place where it had previously switched to Orange without a hitch, and had no signal.
I had to call T-Mobile who talked me through how to reset it. Their conclusion was that I had just returned from a holiday in the USA, and by roaming on my phone over there, it had stopped the Orange switching facility when I came back to the UK.
I had to call T-Mobile who talked me through how to reset it. Their conclusion was that I had just returned from a holiday in the USA, and by roaming on my phone over there, it had stopped the Orange switching facility when I came back to the UK.