I reckon it's down to the network itself - for about 8 years, I had been using a 3 dongle and was happy with it - even recommended it a couple of times on AB; then last year I decided to upgrade to the 4G ready dongle but the connection using that turned out to be so bad so often. For example, just about every day in March this year it would start off ok until lunchtime, when the connection would drop out altogether for up to a couple of hours, and then the connection speed was at a dial-up rate, i.e. very slow, for the rest of the afternoon before recovering somewhat during the evening. In May I had had enough, and got cable broadband as my main ISP; I couldn't afford to buy out of the 3 contract so I still have that dongle which I could still use if nothing else works.