This makes me wonder why anyone would want the RIMM MBA service with an air card if you only use the connection on occasion.
you cannot get RIM services on an aircard, aircards are a VERIZON item nothing to do with RIM & BB'saircards do have BBA, it is $60 month, requires a separate dedicated line/phone#, it cannot be turned on-off 'willy nilly' or be prorated, you can vacation it, for max 6 month period and that requires a service charge to do so
example NEW card 2yr contract, put on 'non-use' vacation for 6 months, the 6 months of non-use extends your contract another 6 months, every month of non-use extends the contract termination date another month,
AFAIK: 6 months is the max length time allowed for a non-use in a 12 month period.
a BB or PDA is a phone, it goes on a phone account line, the data is a feature-plan, data is REQUIRED on BB's and PDA's,
the advantage is you can change to another phone & drop the data charges, and then change back to the BB or PDA 'with data charges' when ever you want too. with out incurring termination fees..I know because i have this, with a Motorola Q9m and a HTC Touch 'xv6900' , these are PDA's running widows mobile.
AFAIK: you cannot change an aircard account to a phone account, you cannot to my knowledge take an existing line/ph# on your account and switch it to an aircard