According to #141 re-add shared phonebook group:

Make contacts in shared groups (based on visibility level other than "Me only")
visible, searchable and exportable by other users,
Make contacts able to be free of group.
small fix on send sms page : save selection if focus is lost

* Users can now share their contacts by changing group visibility level.
If user selects "Members" or "Anyone" for a group and select that group for a contact, then all other users can see this shared contact and group name on phonebook page and search results on send sms page.

* Users can create or import contacts without need to create any groups for it,
contact may belong to no group, may belong to one group or many groups.

* When user types number in destination select box and clicks outside, input does not dissapearing anymore. This small fix does not affect search script.

All changes was tested in a test environment with php 5.3 and MySQL backend.
This request is to implement accepted feature #141