Arduino ethernet shield to send sms

Hi,
Ii' doing a project where i'm supposed to calculate and send power consumed values to a GSM mobile. My doubt is whether arduino ethernet shield can be used to send sms to a mobile or do i need to use a GSM Modem for arduino?

Most providers have an email address that is associates with a phone number that you can use to send a text message. For instance, if you want to send a text to an AT&T phone number you can email <phone #>@txt.att.net.

Alternatively, something like Google Voice may be used to send SMS messages. Either through email or you can mess with their API.

Thanks a lot for ur reply..... U have given a very good idea... :slight_smile: