Just joined up and Im getting pretty worried.
I have a Samsung Galaxy S4 and have done all the usual stuff:
Tried selecting a new network and then rejoining O2/Giffgaff
All to no avail, I had a call today from someone but it seems to drop in and out.
I can call my wifes phone with my phone right next to it but cant get her to call me successfully.
Really need this sorted as I was mucked about by Vodafone for ages so it feels like just another con.
Check to see if there are any issues or outages with the network signal where you are:
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
check your area status here for service problems: www.bit.ly/ggservicestatus
If the signal in your area is working as normal then try a manual roam to update and refresh your network connection. http://is.gd/manualroam
samsung galaxy settings: http://community.giffgaff.com/t5/Settings-for-your-device/Samsung-Galaxy-range/ta-p/8854998