Common suggestion is to pick up a SIM for the networks that you are looking at, and see which offers the best signal.
People seem to slate O2, but around the centre of Bristol speeds appear to be perfectly fine. Maybe my view on what is "slow" is different to everybody else's, but I get 4Mbps down/1.6Mbps up in an area of a building that is known for being very weak. HSPA+, of course. So it really does vary.
If you don't require huge amounts of minutes or texts, giffgaff is a good choice. Even though they may be raising the price on their £10 goodybag (£13), that would bring them right in line with Three. At that point...again, just a case of finding out which is better for you.
People seem to slate O2, but around the centre of Bristol speeds appear to be perfectly fine. Maybe my view on what is "slow" is different to everybody else's, but I get 4Mbps down/1.6Mbps up in an area of a building that is known for being very weak. HSPA+, of course. So it really does vary.
If you don't require huge amounts of minutes or texts, giffgaff is a good choice. Even though they may be raising the price on their £10 goodybag (£13), that would bring them right in line with Three. At that point...again, just a case of finding out which is better for you.