I only use a cell phone.
  
 Yes
  
 Yes
  
 I use a paper calendar (wall calendar, datebook, etc.).
- Personal e-mails sent to me or a small number of recipients.
 - E-mail discussion lists (where people can reply to the whole group).
 - E-mail announcement lists (usually one-way communications that are sent to a group)
 - Person-to-person text messages.
 - In-person meetings