Unlocked verizon htc one m8 on simple mobile

[AC Question]

im in the detroit MI area not sure how network map is set up here for 4G but i only get 3G and drop calls all the time. Do not have access to my voicemail for some reasons.Anybody have experience the same problems? and maybe know what to do?
ive only heard/read good things about HTC ONE M8 unlocked but now that i bought it reading back reviews.
please help