Can I use ARTIO VM SMS in Viet Nam ?

I have installed ARTIO VM SMS on my website, I have credit to use SMS Service.

When I sent SMS to test, I didn't receive anything, but my credit was subtracted.
I'm in VietNam, and I send SMS to mobile number in VietNam.

Please help me.

Thank you.

Dear vunh27,

we have contacted our SMS provider to check it.

Hello ange,
I'm still waiting for your help.

Thank you.

Dear vunh27,

I've answered you by email.

I've read your email.

Thank you for your replying.

But seem it is so complicated for me to use your sms services.

So maybe I won't use it for my website.

Thank you.