IMPORTANT Android 4 notice: automatic APN setup is not possible in ICS and higher. The app can supply manual assistance where automatic setup is unavailable. Rooted device owners can now work around the problem by copying the apk to /system/app (just once, updates will continue to work)
Be aware: the app changes nothing on your phone until you *run* it. A good option is to install now but only run after inserting a giffgaff SIM. In normal use only existing giffgaff (and optionally O2 UK) settings will be changed, so swapping to another SIM should just work, useful for visitors to the UK. If you do have problems or need to restore O2 UK settings Advanced mode can restore stock settings.
The app cannot change a number of settings that will prevent internet access, please read the included troubleshooting guide for help.
IMPORTANT: The app will add correct mms settings but you MUST also follow the steps in the mms troubleshooting list. In particular if you leave O2 APN's installed don't expect mms to work reliably and you may be charged for messages that fail. I MAKE NO GUARANTEE THAT MMS WILL WORK AT ALL.
In automatic mode the app installs a basic dual APN configuration known to work on the majority of phones. The Advanced menu has options that may give better results on some phones.
On ICS,JB and later uses a single APN to save on manual input.
CALL_PHONE,READ_PHONE_STATE required by the tools menu to control voicemail service settings and access balances. Provided you have a giffgaff SIM none of the calls are chargeable.
ACCESS_WIFI_STATE,CHANGE_WIFI_STATE used by test button to ensure mobile data is actually tested, not WiFi
SYSTEM_ALERT_WINDOW allows the HUD helper window to float above other windows in cut&paste mode
Not got your free giffgaff SIM yet and want to support the app? Order a SIM from the web link below, when you activate you get £5 extra credit and I get a referral fee. Just want information, visit giffgaff.com