Did you know you can look up people's email addresses, if you use your iphone with Exchange?
If emailing, press the plus to add names, then the groups button, to the left. now choose Directories. It probably says email@example.com. In the search box, put in a few letters of the address or name you are looking for, then hit search and there you go!
Also, to put a period after a sentence when typing, just hit space twice, and you'll get a period and two spaces without going to the punctuation screen. Neat.
5 months ago