Txtmate.com lets you send free sms/text to any mobile network numbers in the Philippines. I am not sure with Smart and Sun but it works with Globe. I tested it, and I was able to receive the message I sent via their website.
Since it is free, you can expect that there will be some phrases that will be inserted to the message. The text message you will receive have the following line at the end:
“Msg was Sent from http://www.txtmate.com“
But nevertheless, it works quite fast on my end.
You need to register first before you can send SMS/text. Txtmate.com is also a social networking since you can add contacts to your account. The site also an area for chatting. I checked their chat page, and there are actually people using their chat page. So you are not totally alone in that site.
This service is brought to you by a Bacolod, Philippines based Mobile Solutions Company called Econtent Providers.