Multiple online services claim to help you send SMS from web or from PC to your subscriber’s cellphone for free. If you’re on a budget, you can go ahead with trying them out, but please do understand that most of them come with the following risks: Sharing of your business info during registration; Possible compromise of your SMS list and the resultant legal hassles; Inclusion of unsolicited advertisements in the SMSes sent to your subscribers; Poor deliverability, and more. Stick with proven SMS texting services that do not damage your business reputation or your customer experiences in the long run.