Apple Text Links

sms

"The sms scheme is used to launch the Text application. The format for URLs of this type is “sms:<phone>”, where <phone> is an optional parameter that specifies the target phone number of the SMS message. This parameter can contain the digits 0 through 9 and the plus (+), hyphen (-), and period (.) characters. The URL string must not include any message text or other information." (source: Apple Developer website)

Application homepage: http://www.apple.com/iphone/iphone-3gs/messages.html
iTunes link:
HTML Link example: <a href="sms:1-408-555-1212">Launch Text Application</a>
Native application URL string example: sms:
Extended example: sms:/open?addresses=1-408-555-1212,1-408-555-2121,1-408-555-1221
Tags:

More information on the Apple Developer website.

An undocumented use of the SMS scheme was sent to us by Jonathan Balley:
You can use the undocumented:
sms:/open?address=<a number or iMessage address>
which allows for multiple recipients (notice: ?addresses=):
sms:/open?addresses=<comma seperated list of numbers/addresses>