Developer mode

User-interface Said:

"i can see it and I’ve been following the little things they leave behind. Takes me to w3 website code developer stuff things have changed on my phone and they’ve tried to get access to my banking and other pay sites. I’m asking how to stop someone from accessing this through code or c++ or whatever what’s the best way to combat that just straight up??"

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Try This:

With Security & Privacy being of hight concern here, consider the following...

A. Secure Your iPhone:

• Erase your iPhone: How to erase your iPhone, iPad, or iPod touch - Apple Support
• Scam call and pop up blocker: Malwarebytes Mobile Security on the App Store
• Firewall & Privacy Protection: ‎Lockdown Apps on the App Store

And...

B. Secure Your Accounts:

• Modify: your login credentials (New eMail and New Password)
• Associate: a different method of payment to your account
• Enable: Two-factor authentication for Apple ID and all other accounts, that have such an option

I have someone accessing my MacBook and I phone

Why do you think that?

I can see what they’re accessing in my phone.

Exactly what do you see to give you that impression?