How do you bypass voicemail greetings?

Answer:
To leave a message, use the following keys:
AT&T

* or #
Sprint

1
T-Mobile

#
Verizon

1 or *


To skip the greeting and login, use the following keys:
AT&T

1
Grand Central

# (no need to wait for the greeting to begin)
Sprint

T-Mobile
Verizon
#
First answer by Applecore. Last edit by Vocalogic. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 14 [recommend question].