Summon to military service, as in He was called up for active duty. [Late 1600s].
Cause to remember, bring to mind, as in These stories call up old times. [c. 1700] Also see call to mind.
Telephone someone, as in I'll call up the theater and find out about tickets. [Late 1800s]
Retrieve data from a computer memory, as in I asked him to call up the last quarter's sales figures. [Second half of 1900s]