There are GSM gate openers. These have a couple of relays and you just dial the GSM box let it ring a couple of times and it opens the gate. You can set up via text messages allowed numbers etc.
Have a look at these links
http://www.gate-opener.co.uk/
http://www.quantekshop.co.uk/gsm%20g...ontroller.html
http://www.alibaba.com/showroom/sms-...-wireless.html
http://www.gsm-caravan-alarm.co.uk/m...ate_opener.htm
And a homebrew version
http://www.35thchamber.com/content/s...ed-gate-opener
Uses google voice,may be able to use Skype or VoipBuster.



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could also get hold of it.
