Spotify mobile is "currently exploring different social options for the free, ad-supported service on mobile. Right now, the ability to search for and follow your friends is unavailable."
It isn't your device's fault that the page just loads when searching for a user. Since you aren't a premium account you are limited in your search options and flexibility. I hope this helped you out. If you have further questions dont be afraid to ask and if I didn't fully answer question call me out on it. I would like to help you out, I don't want to further confuse you.