There are basically 2 strategies
1. Dial via landline (POTS) to an outfit that sends SMS messages for you.
2. Connect your computer to your mobile via a mobile phone modem
The method you choose will depend (probably) on the volume of calls and required reliability of service.
Both have been discussed on the forum, and a quick search brought up several including thread708-525894, thread222-193173 and thread222-395733
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If you want to get the best response to a question, please check out FAQ222-2244 first
'People who live in windowed environments shouldn't cast pointers.'