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image:MightyText
MightyText is similar to iMessage, except for Android. You can send SMS from your computer or tablet, and still use your own phone number. You'll also be able to screen incoming calls by seeing the caller information on the computer. This is also a great way to stay in touch with friends and family if you forget your phone at home or work and can't run off to get it right away.
It's helpful if you have a hard time typing using your phone or in some cases when you have to handle alot of incoming messages.
ref:cnet.