In case that any one is looking for a way to add a signature to a SMS message the easiest way is:
using the auto text to create the signature you want to use...
mine is ealvnv
go to auto text
new
replace:
ealvnv
with:
123
using Smart Case
language All Locales
save.
now when you want to add you signature to a sms message just type 123 and your signature will show up...
