Yes, MintSim is cheap. But even cheap service isn't worth the money when you don't get what you are paying for.
Customer service is a joke. All your calls for service will be answered by an overseas call center. English may or may not be an issue. And when you complain about overseas call centers? You get told, "everyone else does it." That is not the attitude I want from the customer service staff.
My wifi calling does not work properly. Yet whenever I call I get the runaround. They start by telling me that not all phones work in all situations in all ways. Guess what? They know exactly which phone I have and they know exactly how my phone works. Then I get ten minutes on how porting my phone number over, bla, bla, bla. Everything but actually trying to fix my issue.
I get calls that never come through to my phone yet get answered by voicemail. I get lots of dropped calls. And I get no actual support from anyone connected with Mintsim. Just a bunch of excuses to get me off the phone as fast as possible.
Sometimes you get what you pay for. Sometimes you get less.