In Zero Keyboard you can manage the workflows publication for each team, set specific settings on workflows, but you have also access to settings that will apply to your whole company.
When it is set, all users from your company that will login with the mobile app will be added to this team.
This is used to avoid having to add all users manually to teams, but of course it won't help a lot you if you've divided your company in many teams.
2. Scanner & OCR
Phone number formats
When a contact or lead is created using the business card scanner, our software will push the number on the card, regardless of the possible validation rules you have.
Here you can force a format. This helps you to have clean entries to your Salesforce. The correct country code can also be applied if needed (and if the country has been correctly identified).
Note that the current 2 formats will be replaced by a single one in the near future.
3. Contacts tab
You can apply a SOQL filter to limit the contacts shown to users. It's up to you to decide what the rules are. Leave this blank if you don't know how to use it or ask for help.
The most common rule is to limit the user to his/her own contacts, using a magic word : ownerid = '#USERID#'