Well...I m looking for someone though a cell text?? Anyone can help?

Well..theres this guy..he used to be my boyfriend his name is Steve Worthington...and Im trying to get a hold of him through his cell...by texing thim..everytime i sent him a text i get in a message saying failure or someing like that..but I miss him so much. His number is 8634301179 and he lives in lakeland Flrida...whats the area code?? Who ever lives down there..please just please how can i get a hold of him...like..i mean like is it 863430179@singularm. com or cingulerm.com? but thats his phone company thing. But help me please