Forms with fewer fields seem less daunting to users, especially on mobile, where typing lots isn’t always ideal. 
Try asking only for a couple of fields to sign up, then ask for additional data later on when it is needed. For example, ask for a postal address when you need to ship or bill something, rather than at sign up.

Forms with fewer fields seem less daunting to users, especially on mobile, where typing lots isn’t always ideal. 

Try asking only for a couple of fields to sign up, then ask for additional data later on when it is needed. For example, ask for a postal address when you need to ship or bill something, rather than at sign up.