sorry, wrong thread...

You can download Android applications for text messaging and for email.

For example, there is Google Voice, which you can use to send text messages. With Android, Gmail should be preinstalled on the phone, and you can use that to send email messages.

Both can work over WiFi.

What is best way to send/receive text message to/from gmail or yahoo email address using wifi between Android devices.

not to use any talk cellular phone minutes,
between different carriers,
but mostly Androice devices,