MacRumors scores yet more evidence Apple might just be considering adding a free level of MobileMe service for iPhone, iPod touch, and iPad owners on iOS 4.2.

The evidence comes in the form of a new private framework known as AppleAccounts.framework that includes a series of device-specific error messages referring to free MobileMe accounts. In particular, the error messages include alerts regarding having reached "the maximum number of free accounts" for a given device and certain devices not being "qualified for free MobileMe service".

It looks like email won't be going free but Find my iPhone, Gallery, and sync services just might be. Interestingly, that matches what we saw on Me.com a couple weeks ago -- Find my iPhone and Gallery being listed as no-subscription required apps.

Anyone starting to believe?