YouTube app on Android "signing in" forever
I recommend you to use a VPN Client to mask your original IP and circumvent lockout from youtube.

VPN clients I personally use are:


HotSpot Shield
Droid VPN
One Click VPN


All of it are Free but with some downsides. Hotspot shield gives you a US IP but will put small ads when you are browsing. DROIDVPN free version is limited to 100MB a day and requires to registration. One click VPN free has no ads and no limit, but you cannot choose your preferred country IP, it will be randomly chosen.