Why Do 3G Smartphones does not support a 4G SIM Card?

3G smartphones do not support 4G SIM cards because 3G works on Wide-band code division multiple access(WCDMA) technology whereas 4G the fourth generation of mobile communication works on Long term evolution(LTE) standard, is comparatively a new technology that is different from WCDMA.

Therefore 4G SIM card will not work on 3G handset

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