Htc desire 510 only EDGE

Hi guys i bought from US a htc desire 510 and unlocked. When i put sim it has only EDGE network. Please help me how i can change EDGE TO 3G. WHEN I TYPE *#*#4636#*#* AND TRIED CHANGE NETWORK TYPE TO WCDMA NETWORK LOST ON CREST ON NETWORK SIGNAL.

PLEASE HELP ME. THANK YOU