Can apple somehow disable ''Restrictions'' option in my iphone?

I always read this crazy stories in the news saying that kids were playing games and one day a huge bill came from Apple asking to pay. Well i have already ''Enabled Restrictions'', and enter a passcode to prevent someone turning the restrictions off. But i wonder if something or someone can turn it off again (without using my physical phone) and buy some apps or pay for something and they i will get the bill without knowing it, is it possible? Sorry my question may sound strange but i have just started to use smartphone and kind of afraid of this. And maybe you will be kind to answer to my second question too. How does Apple know where and to whom send the bill if you don't register any credit card in your iTunes account. For example i accidentally click '' to buy '' or upgrate some app or game will i still get the bill if i don't have credit card or money on my account. Thank you guys, will hope to see some good answers and sorry if my question seems stupit

1st question no they can't. 2nd if you don't have a credit card or any way to pay for apps you won't be able to download them if you use a gift card and it doesn't have enough money then you won't download it

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