Uh... not sure how accurate that reply was. Data connections do use air time (e.g., refreshing buddy list, etc.).
http://www.getitnow.vzwshop.com/fnd_toolsApps_all.as ... »

With Version 2.0.1 of the client login and contact list refresh uses Minutes of Use (unless you have a VPAK data plan, in which case KBU usage applies) otherwise standard text messaging rates apply.
*Airtime is required for use.

However, having IM's just forwarded as SMS messages will not use your airtime. SMS doesn't use airtime in any application. Only MMS (Pix/Flix) use airtime. If you have the V-Cast packs or America's Choice Premium, nothing will use airtime becaus...
(continues)

He asked if he would be charged airtime while connected. That is not the case. Is he charged airtime when downloading the app, absolutely.

"...Such as refreshing the contact list, and so on?"

You are charged airtime for that... unless you have a data plan that includes it.

Take calls on it every day. Yes, it does use airtime, but for specific functions. Sign in & buddy list refresh. Messages and status changes: since these are fully completed thru SMS, airtime is not charged or required.

Thanks for the link and clearer/accurate reply. 🙂

Also, does it charge per minute if just sending and receiving an IM on Mobile IM? I'm thinking no, but I want to verify.

Thanks again techie2001, seems you've already answered this question. 😁