When offline it always asks me to login

[tomg]

The iOS app *always* asks me to login in offline mode. Which defeats the purpose of offline playlists. Which is what I pay for.

So I have to make a (roaming) 3G connection just to login with facebook, switch apps... 

Note: my time to go online again was more than 20 days.

[Stupify]

The iOS app's Facebook login function is broken, so you should use a device password instead.

http://www.spotify.com/account/set-device-password/

Make a password there, then instead of logging in with Facebook, log in with Spotify details, that are your user number and the password created above. This should make your offline mode work nicely.