The only thing that makes me ask the question here is that this is occurring in 3 different areas.
Since Saturday night at my home location (Bagshot, GU19) I lost all network connectivity. Thinking nothing of it as it will probably be resolved by morning, plus the fact that 3's customer support line was shut I went to bed expecting it to be up.
Sunday morning I woke up and still nothing. I went round to my partners which is in Bracknell (RG12) i had network but only 1/2 H+ not the usual 3/4 bars of 4G. Fluctuating like mad! So I rang them up after checking with my partner's sister as she is on 3 (she had no issues) i spoke to them about this issue and they said they were aware of an issue and it had been fixed 2 hours ago.
Again I left it and waited as they said they had fixed the issue. Service picked up to 3/4 bars of 4G like normal. Went home later that evening and my phone was fluctuating between no service and full 4 bars of 3G (H+) signal (there's no 4G in my area yet). Again I thought as they said it was fixed it may still be throwing a bit of a fit and will be fine in the morning.
Woke up this morning to no service whatsoever. A bit pissed off I drove to work (Farnborough, GU14) and i still have no service. Now I don't know if there is an issue with my phone or not but again a colleague has a 3 sim and his is fine. This is what leads me to think there may be an issue with my Nexus 5.
Any ideas of what I should do ?
Edit 18/08/14 @ 13:30 - Went outside of my work for lunch across the road to the shops, funnily enough got signal while outdoors and then lost again when indoors. Looking more like a network issue ?