Originally Posted by oracleoftruth
While not the fastest, o2 have very robust and reliable network (it's been slightly dodgy in areas where they've been upgrading but much better now).
Join giffgaff: cheaper and more reliable. May not be as fast though. And check local o2 signal first
Ehhh... I switched to Three from GiffGaff after nearly 4 years and despite these "issues" (I'm sure the G3 is at fault here, my One M7 never experienced any dropouts) I'm glad I moved. Paying extra for 4G, removal of unlimited data, generally unhelpful community do not give GiffGaff the same ethos it once had when I joined in 2010...