Text Codes for Rental Yard Signs, and Text Marketing.

Hello

I have a bunch of rental properties and i put a yard sign and an information box with some pamphlets about the property in the yard. However i want to get a text code where people can text "Info" to 5555 for example and they get a text back with all the property details and a link to my website.  I would like to have 3-5 separate codes so that i can have 3 signs at multiple places for rent at one time.

Does anyone know of some good services they use? I have looked around and i don't want to spend $600 a year for this. 

Also does anyone know of a texting program or voicemail program where i can send out a blast text or call to people who have inquired about properties in the past about an up coming vacancy. I have a couple hundred numbers stored. 

Thanks Keith