Gigaset C610A User Manual page 80

Appendix
Setting upper/lower case or digits
Press the hash key # briefly to switch
from "Abc" mode to "123" and from "123" to
"abc" and from "abc" to "Abc" (upper case:
1st letter upper case, all others lower case).
Press the hash key # before entering the
letter.
You can see in the display whether upper
case, lower case or digits is selected.
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