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Method 1: Simple Mobile CRM
01. Users signed up Simple Mobile CRM, and joined same team.
02. Team members could viewed the notes and comments of each other, after the perssions are set up.
Method 2: Shared Google Account

Here we assume all team members have access of another Google account, e.g. '[email protected]'.
01. User A signed into his/her own Gmail account, but use the Shared Google account for SGN login.
02. User A put down notes in Simple Gmail Notes as usual.
03. User B also uses the shared Google account for SGN login.
04. User B should be able to view the notes of A now. The notes written by B will also be visible by user A.