Hey guys, i need help on how to build a commercial sms sending website...pls share tip swith me

Well, I have a small program that will send SMS messages. It's quite simple, really. You just have to look up 'SMS Gateway list' on Google, and go from there.

FROM there, though, you can simply use PHP's mail() function, and send the 'email' to the SMS Gateway. Of course, the Gateway will route the email to the user's phone, as well as sending it pseudo-anonymously (it shows up for me as 999-999-9999).

You can see the script here, but please note that it might not work because it's running on a free host, and I think they limit my outbound emails.

If you want the full script, just ask

-PG

Do be aware that there's more to it than just sending texts - there's the whole CRM thing - a lot of messy customer handling over subscribe/unsubscribe/didn't get that why have I been charged etc etc.

This is a lot more than just sending text over the air.
There are several layers that send append their security messages as the message goes through them. This is the senders's scenario.
At receiver's end, the protocol says these security layers are removed one by one and the original message is being received by the end user.
You might have seen the message at the end "Sent From..." or something similar. This is the task of the first layer at sender's/ receiver's end.

If you want to get this developed, I own an agency and can get my developers work on your requirements.

Kindly get back to me as required.

I actually just stumbled onto this earlier today: http://davidwalsh.name/send-text-message

I haven't had a chance to test it out yet, but it appears to be a fairly simple solution.