The user has Read and Write permissions granted by Organization-wide Defaults (OWD), Role Hierarchy or Sharing Rules but is unable to edit the Call record on an Offline device. The user can edit the Call Record Online.
This is working as designed. Only user-owned Records can be edited on the Offline devices.
Send us your feedback: We're always looking for advice to help improve our Knowledge Base! Please let us know if this article was helpful or provide feedback on how we can improve your experience here.