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Our takeEditorial$45 for 40 GB on AT&T with international calling included - a solid mid-tier option with no major surprises.

$45/month on AT&T with 40 GB of high-speed data and unlimited international calling to 70+ countries.
Prices may vary by region, promotions, and account history. Check H2O Wireless's website for current offers.
Forty gigabytes covers substantial smartphone use - streaming audio daily, video calls, maps, social media - without much concern about the cap. The throttle after 40 GB isn't specified beyond the source noting it throttles (unlike the 10 GB plan which lands at 256 Kbps). International calling to 70+ countries is included, the same as the lower H2O tiers.
For the price, this is a well-rounded AT&T MVNO option for moderate-to-heavy data consumption with regular international calling baked in.