How to register
Settings -> Run assistant
Username: 41000009
Password: <password>
Domain: sip.wisephoneplus.com
Other settings stay the same
How to make calls
In the main screen
If you're going to call text contact, such as "john@sip.wisephoneplus.com", then click on "Phone number or Address" to access system keyboard, finally click Call button as normal
If you're going to call digit contact, such as "41000001", use app's keyboard directly