Well sorry to pee on your cornflakes, but the system works flawlessly.
Having had an iPhone since 2011, it's not made a mistake yet. It'll either send an iMessage, or an SMS. And my SIM card has been in other phones in that space of time too. Android and non smart phones.
The iMessage facility only works between Apple products. Therefore if your SIM is in an Android or crappy basic handset it won't send an iMessage, neither will those non Apple phones receive an iMessage either. Regardless your phone number previously being on Apple's database, if the SIM is not in an Apple device, it won't send (or receive) an iMessage.
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