Can Apple give an option to check cellular data usage for every bill cycle?
As an addendum to bmike's answer, this may be entirely provider-dependant.
On O2 UK, I have no option to view my usage per bill cycle, only since last manual reset. My provider has an app to view usage [&amp; many other provider options].
The Euro-equivalent to 'Cellular', Mobile Data show the overall usage since last reset, plus a long list of usage per app below.
It is not tied to the provider's billing cycle at all.
I do, btw, have my provider's profile correctly installed; this is not a configuration error. The blue 'Network Provider Services' links through to their home page, for those who don't have their app.