can your iphone be hacked into?

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anywhere you can get hcked being on line with your iphone. because my one of my friend said he got hacked when he was onhis phone on fb and he said that somone got hold his phone number on the chat box that problem when your phone onto to the facebook andriod connection line I heard that on the notice page that whatever happens to your stuffs or password when youre online using your iphone on fb android that its easy to be hacked because they dont even keep your half of your information about you on the android on cell phones plugging safer . whenever someone im you that your phone numbers shows up front of the other side someone else chatbox. that how bad people steal your # .