Not at all. Some things can be quite secure and repel all but the best hackers, other things can have poor security and all but the casual hacker can get in with a little effort.
Same thing with your house... you can have an alarm, a dog, great locks, etc. but a pro might still be able to get in... others might simply lock their doors and that might stop some drunk trying the locks but not stop a burglar who can at least pick a lock.
I don't believe there's any such thing as 100% secure for anything... not for a building and not for a computer/device. The more effort you put into securing something, the harder it is to breach... but it's all a matter of who is smarter and puts in more effort and who has more skill... you or your attacker.
You are mistaking the word "secure" for the word "protected." They are not the same. Look up the words.