General Is 3G connection required for texting?

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http://androidforums.com – I have a good wifi connection and can make phone calls, but I can't send a text. when I try to send a text, I get an error message that says "message not sent." with no explanation. I noticed the data connection says "connecting...." do I need a 3G connection to send a text? I thought texts can be sent with just a regular voice connection. quite often my data connection is off because I have wifi, and I can still send texts. what could be causing this? any ideas, please let me know. thanks gary in vermont (General)