You are correct. If you have a Vision phone, it's $15 for unlimited web/data access (including unlimited picture/video mail) and an additional $15 for unlimited text plan. They are two separate services and no longer bundled together now that Sprint uses SMS text messaging. As for mobile to mobile, additional charges would depend upon your plan. Most of Sprint/Nextel's plans now include M2M, but if you have an older plan that doesn't include the service you have to pay $5 for mobile to mobile. The reason? Voice calls are not tracked the same as data usage, so your data usage does not impact the number of minutes used.