Ultra Mobile, the parent company of MintSIM, just announced another plan that can be cheaper than MintSIM, called the Ultra Flex
To sum, the plan has unlimited talk & text + 250MB (individual plan) or 1GB shared (family plan) data for $11.50/month, if you sub for 4 months, or if you get 4 accounts. Data add-on cost is $5/500MB or $10/GB. If you want minutes and don't need all of MintSIM's 2GB allotment, Flex would be a cheaper choice.
Edit: The unlimited talk also include the countries below. Unlimited text is global. The 250MB/1GB data is non-expiring and rolls over to next month.
CANADA | CHINA | FRANCE | GERMANY | HONG KONG | ISRAEL | MEXICO | SINGAPORE | THAILAND | UNITED KINGDOM