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here`s all ive got on the no service front
firstly turn your handset off then back on.
Check to see if there are any issues or outages with the nework signal where you are: http://www.bit.ly/ggservicestatus
If network signal is fine you can try manual roam to see if that helps http://community.giffgaff.com/t5/giffgaff-Top-Tips/manual-roam/td-p/3345471
some people have installed this android app for improved reception and reckon its better.i`m not sure myself
if you have an iphone try turning airplane mode on and off again.this doesn`t always help but it has been known to work sometimes
Which part of london? It's a big city after all.
Have you checked the service checker for your area? http://community.giffgaff.com/t5/Service-Updates/Service-Checker-and-Planned-Mast-Maintenance/td-p/4...
Thanks for your post:- "Check O2 site........" came closest to being helpful. However O2 only admitted they'd had problems which were reported in media stories two days ago.
Thanks again to you and others who tried to help with responses to my post.