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Reply To: 2G to 3G HO


3G is usually overlaid on the 2G so most likely you will run out of 3G service before 2G during a call.
So it make more sense to allow 3G to go 2G than the other way round.
This is true only for dedicated mode, in idle mode both 3g and 2g reselection is allowed . So mobile can reselect to UMTS again when the target EC/IO is met