A: Although a version of OneNote has been available for the iPhone for a while, only recently has a version become available for the iPad, at the webpage at Apple’s iTunes site or within the iTunes application store (search for OneNote).
A free version is available and an upgrade for $14.99. Both the free and the upgraded version have the same features with the free version limited to up to 500 notes, while the upgraded version allows an unlimited number of notes.
To check the number of notes you have created/accessed, put the iPad in landscape mode, click the Settings button, and press Upgrade. This shows the limit and the current usage number (see screen shot below). 
ipadonenoteinstance-Copy
Be aware that you can’t open password-protected sections on the iPad or iPhone client.
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