Yes but that also includes unlimited texting and $1 per min calls. The other two plans make things even cheaper. Though pay per use its $2 per mb which is 2x as them, but if you really only need it once or twice to check something then it's much easier to keep att sim since besides that you get free receiving texts, you get charged for sending text $0.50 and making and answering calls. Plus you don't have to deal with all the issues or charges of activating iCloud services on the phone.How's that? ATT's (my carrier) least expensive international roaming plan is $30 for 120mb. My math says Always On @ .99/15MB is less expensive ($15 for 150mb).
This service needs to be at least 4x less than what they are charging to break into the market imo.