1) Open Acrobits, and press 'Menu' button on Android handset (Varies between manufacturers)
2) press 'Settings', at the bottom right of the screen
3) Press 'SIP accounts'
4) Press 'Add New Provider'
5) Find Voipfone in the list, and then click on it.
6) Fill in as per below.
Username- If you're using a single phone, this is your account number. If your using Virtual PBX extension's, it should be your account number, an asterisk (*) and your extension number, in the format 3XXXXXXX*2XX
Password- If you used your account number, without an extension number for the username, this should be set to your master account password which Voipfone email to you when you sign up. If you're using extensions, each extension has its own password, which you can find by logging into your account and going here- https://www.voipfone.co.uk/account.php#view-pbx
You are now ready to start making calls with Acrobits!