Should a 3G mobile handset support GSM and WCDMA. tri bands.
The classification 2G 3G DEPENDS ON DATA RATE.
ALSO
In 3GPP LTE is it mandatory that mobiles should be able to switch between GSM AND CDMA NETWORKS.FOR INTEROPERABILITY.
so you mean to say in LTE it is not mandatory. It can be a standalone GSM or WCDMA , not that it should support both
I know in 3G it is not manadatory.