From personal experience, I can tell you that matrix sim cards are the best option that you have when it comes to international sim cards. I went to Malaysia recently for work and my office admin gave me a matrix connection. I though it wouldn’t work just like some Roam1 connection I used last time. I was wrong! The matrix number worked seamlessly. Kept me connected throughout be call or email and didn’t trouble me at all. Pretty impressed and would rate it 10/10.