question

We have RingCentral Standard. We have multiple users in one department that we are giving individual extensions to but don't intend them to have separate phone lines. They only need one phone because their hours don't overlap much. They will often be using their smartphone apps. We would like them to be able to text when they need to, but that only works for the one extension assigned to their phone. Is there some way we can make all their extensions able to text without getting phone lines for each extension? We want them to be able to share that single phone. Or, must they share the same extension as well?