The giffgaff mobile app lets you manage your giffgaff account with the tap of your phone. You can check your data use on the go and connect to literally thousands of WiFi hotspots all across the UK with WiFI Extra. But that's just the start of what the app can do. It's a bitesize wonder. - Check how much data you have left - Buy or recur a plan - Keep an eye on when your plan expires - Add credit or turn on auto top up - Pay with a saved card or PayPal - Redeem a voucher - Access the community