HELP: iPhone EDGE displays grey box


hi

on iphone on past few days whichever sim use in it, instead of displaying edge (e) logo displays grey box.. im not sure why , cant onto edge.. virginized iphone , reunlocked using ziphone , still same problem...

appreciated.
 

if there's e, means edge.

if it's box, it's gprs.

gprs being slower edge.
 


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