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Problem: Despite seemingly strong signal (4G showing 3-5 bars on my iPhone 6), data is either extremely slow or (more and more often) there's NO data working at all. If I go into settings and turn off 4G, so that it is forced to connect to the 3G net...

Very poor performance on O2's 4G network today in Central London along the A10 Bishopsgate, near Liverpool Street station. Internet keeps dropping out and is virtually unusable. We're accustomed to regular poor data performance on O2's 3G network, bu...