Your team can pass information to each other related to a claim using an 'on-demand' Action Item. Open a claim, or click the Update Claim blue up arrow. Add an Action Item on that claim and assign it to a specific person or role/group. You can also create an Activity Log and Message Archive to a claim to convey information regarding a specific claim to a team member.
For general 'chat' with your team, we recommend using Slack - there is a free version and it has a desktop and mobile component.