Sounds good, But be realistic
What were looking for is "free roaming" How many free roaming countries do you have.
Goglobalsim had Ukraine as free roaming, but this changed very quickly.
they now charge €0.90 / $1.22. This is more than my orange contract phone
If I have the auto top-up option, The auto top-up point is set at £10
They keep a minimum of £10 on my account so they will always have £10 of my money in there bank account.