[Q] Android Phone Stucked with GSM Mode only..............Help needed urgently topic

I bought a clone iphone 5s. It has actually android jelly bean 4.1.1 operating system and mt6575 processor or whatever it is. but i m facing problem while changing it's network to wcdma only. i also tried some ussd code to open testing screen but i m not able to change network mode from there as well. it has many options in drop down list of network mode like LTE only, wcdma only, wcdma preferred, auto mode etc etc. but no matter what, whatever i choose or select, it stays stuck with gsm mode only. in other words. whichever option i select in drop down list, it goes back to "gsm only" mode own within same second. really frustrated. please help me if it is possible any how to choose wcdma mode only. i ll be very very thankful to u. :crying: