Just got a text saying: "Search for me on yahoo IM so we can talk !! I.D on there is sammyflirt218". I asked talk about what? And they said, "Grr ma reception is horrible :(". SPAM!!!

Jeff My Mom just got the same text just now.. With the same Response. I just got one from 209-852-4468 that says "find me on yahoo messenger that way we can talk ;p nme on there is sammygirlie08" I said who is this and they said. "Grrr Reception is low :("  
I searched that number and it says the number says its a landline from Don Pedro California. Sounds to like someone is hacking into phone lines to me.

Some people are saying they are calling them by the fake name they use on Facebook so probably they are using an app you or one of your friends authorized on there.  They possibly want to hack your Yahoo account by getting you to click on a link.  Report the Yahoo ID to Yahoo abuse and the phone number to abuse@textplus.com