MN_Sendsms

With SMS Text Messaging add-on you can set your store to automatically send text-messages to your customers whenever they make a purchase. You can also choose to be notified when an order is placed, so you will know the exact moment when someone bought something from you.
A text-message can be sent:

automatically to the customer when he makes a purchase
automatically to you when a customer makes a purchase
automatically to the customer when you put his order on-hold, or you release his order from holding status or when you cancel his order
automatically to the customer when you ship his order
manually to whoever and whenever you like using customized sender name

You can also send text-messages manually to multiple phone-numbers comma separated.
To use the plugin you need to sign up for a 24x Magento SMS account at www.24x.com/magento. Signing up for an account is totally free and it gives you 5 free credits then the price for a SMS credit is from just 3.8p (GBP) per text message. 24X power the SMS Text Messaging plugin using the fastest and most reliable mobile networks in the world. This means you can deliver text messages to over 400 networks in over 150 countries around the world with high throughput and super fast delivery.
You will also have access to a full suit of reports. Allowing you complete management of your SMS solution.