Is the iPhone cellular data limit enforced in 3rd party Apps?

I know nothing about iPhone development, but I am drafting a proposal for other people to do the work of creating an App that interfaces with existing systems and data.

I need to know if the 20MB cellular data download limit present on all apple produced apps is enforced by the SDK for 3rd party apps - i.e. If i develop an app that tried to download a larger file will it fail?

Context:

The data file we use is approximately 50MB and many of our customers work on the road and have no access to wifi. If the limit is enforced I need to be enable HTTP Range header support on our server and add this to the requirements for the App so that the fil开发者_如何转开发e can be downloaded in 20MB chunks.

Thanks

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No. The 20MB limit is one imposed by the App Store itself. The only restrictions seen in third-party apps are ones that the cellular provider wishes to enforce (which typically just means bandwidth caps or overage fees if you go over a download cap). That said, it may be useful to support HTTP Range anyway, in case the download is interrupted and you wish to resume it.

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It is enforced; I did not understand your other points.

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The limit exists for downloading both apps and media files (videos, podcasts, etc.), so I'd imagine it's limited for downloads within each app as well.