After a couple of months with Three PAYG, I've moved to Orange PAYG.
Three was fine, with a good, cheap service. However, I wasn't totally satisfied with their data rate. Coverage was good, but data still seemed sluggish. While it was marginally better than O2, and substantially cheaper, I still feel it's not as good as it could be. There's also something substantial missing from Three's PAYG offering: free WiFi. The lack of The Cloud or BT Openwhatever on Three is particularly noticeable. While I barely used it while on O2, there are several occasions where Three's coverage let me down and one of BT's nodes mocked me mercilessly sitting there with a strong signal in my iPhone's WiFi list.
