DELL AERO cell phone is a very bad product made in china. It has touch screen problem , memory card stops detecting, border and bottom portion of touch screen goes bad within 2-3 months of usage which makes handicapped in typing text and accepting/rejecting incoming call and so on more issues boss.
I personally have got repaired/replaced my dell aero cell 3 times within my warranty period and found developing same touch screen issues all the time.