AGM M6 connection issues

HI,
I recently bought an agm m6 phone but i am having trouble connecting. I just can’t call certain people sometimes. I tried to contact my carrier USmobile but the APN they told me to use i can’t figure out how to input into the phone. And i am not sure if that is the real issue! Does this phone just have connection issues??
Any help would be great!
I do live in the USA if that is helpful.
And I tried to factory reset the phone to solve the issue but no luck.

AGM M6 is not optimized for the US last I knew. US Mobile Light speed (T-mobile) is the only one that should work with it

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