Nope, I was in the southern Arenigs, walking northwards from Rhydymain (a little village by the A494 north-east of Dolgellau) towards Dduallt and Cwm yr Allt-Lwyd.
My provider is BT, who I've found to be a darn sight better than O2 were for getting signals when I used to be with them, but I hadn't gone that far into the hills before I had no reception.
On the morning of day three I was on a minor summit, 480m, when checking my grid ref on my phone I noticed I had a very weak signal so I tried calling my wife, but it kept dropping the call. (No, she was
NOT hanging up on me
.)
In the afternoon when I was descending the north-south forestry track, my phone suddenly bleeped with a couple of texts, but that signal was quickly lost and it wasn't until I reached the start of the tarmac lane that I was able to let her know I was alive and well.