Problem Wit Texts n Dialer on Mogul

[urboypab]

hi im having some problems wit my phone..i just got it a week ago so i really dnt know da much about it.....
1st...i intalled the iphone dialer but i realize that is nt that good so i want t go back to the factory dialer...how can i do that??
2nd... everytime i sent a text i get a pop up that says, Cannot recognize one or more recipients or the address is not valid. Would u like to send ayway?? how can i fix that?..i realize that some how when u go to ur mms configuration Tab Service be4 i had a MMS Sprint Conf...now i dnt have anything there the selection part is clear...i cant press new or set as default...

Thank u very much to who eba da would like to help me..