Is it possible to make a 3G Android phone support a 4G sim card network, provided it is rooted and has a micro sim slot?

SOLUTION: Hoping you are asking question as you wish to use a 4G network on your 3G phone. I'm telling you easiest way i know, u can buy an LTE portable mobile hotspotand use 4G internet easily. Voice service anyways is still provided by lower generations even in 4G.

 
[brief explanation from what i have learnt about LTE]
Actually mobile equipment (ME) needs to scan signalling channels in order to register to a valid home network (for voice or data communication) which is done by scanning all the bands of frequency that mobile equipment is capable to communicate with (eg 900 Mhz,1800Mhz…). So there can

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