Apparently there were big problems with Three's network and 3G phones would not have received it, also its possible it may not have been received due to phones not having been fully updated (operating system). I got mine on Virgin/O2 with my iPhone on time and my friend on EE with a Samsung did as well. Have heard of all sorts of problems, including people receiving extra alerts in the early hours of the morning - fortunately I turned mine off after the test. A small number of people could not make or receive calls afterwards. I know it was a test, but hardly a resounding success.