O2 compress data when you access sites over mobile data.  This is known as 'proxy compression'.If you're having problems using FLG over mobile data but not whilst connected through Wi-Fi, and you're an O2 pay monthly customer, try changing your mobile data access point to:Proxy: mobile.02.co.ukUsername: bypassPassword: passwordPlease contact O2 support if this doesn't help, they may be able to provide further advice.