use the with nearly no internet connection with :
Choose in the settings:
- to not fetch images
- to not fetch avatars
- increase the time of sync
Now next time you got internet connection, even if shitty as ~1kbs you can let AndStatus sync.
Also no problem if internet connection is just accessible for some minutes.
Messages get stored offline. You can read, fav., boost, and reply to them any given time. Once you've got internet again even you're replies will be sync.