Using Spotify Premium on 2 devices

[Tuffty]

Hi,

I am not very technically literate and need some step by step assistance if possible.

I have just started using spotify premium through my vodafone contract.  I use it on my samsung galaxy s3.  When I run I use my partners galaxy S2.

For some reason it wont log in on his phone.  

I use the login from facebook account and I think it might be trying to use his facebook to log in.

Can someone help me get logged?

Sorry if this is confusing

Thanks

[Peter__]

Spotify will generally log in using whoever is logged into the Facebook app on the phone if you tap login with Facebook. Can you try logging into the Facebook app and then logging into Spotify?