I'm designing iphone app which allows users to pay bills. To use this app the user should register and activate their account via e-mail. And here is the problem: Which model I have to choose for the first time use of this app?
user register & autologin -> the user can navigate in app but can't do any changes/inputs, can't pay or save data. If the user want to start using this app in full mode he/she must activate an account via e-mail.
user register, activate & autologin -> the user can use app in full mode. The difference is that activating the account will be one more step in the registration process.
What do you think? Maybe someone has already done any research about this?