Qwik ques for n e one out there that can help...just got what I was told was a RAZR m but just wanna make sure I have the model nmbr which is XT912...but do I need more or will there be markings on the back of phone somewhere? Also what is the diff between RAZR...RAZR M...and RAZR Max?? Thank you for any help I m running android 4.0 if that makes a diff in id'ing...or maybe some numbers under settings then about phone can help...thanks