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If you have an Apple Watch, the following app would be beneficial. It works a lot faster with an audible alarm, than with Apple's built-in feature.

 
A pocket-patting habit does it for me. When I know I've my car keys and phone I can go anywhere and do anything.
I used to be scatterbrained about this stuff in my 20s. But at some point I got very tired of locking myself out of my car after the gazillionth time. I started forcing myself to do what you do. Once cell phones came along I added that to the routine.

Sometimes I slip back and that's a reason I started carrying a spare ignition key in my pocket. For my other car that has an alarm, I don't walk away until I hear the 'beep'. If I don't hear that it means I either haven't locked the car or I left the keys in the car. Either way, it stops me.

Periodically though I have to force myself to lock the car(s) from the outside with the key. That makes sure I HAVE the keys and prevents me from locking myself out.
 
Use the phone for important tasks like locking your doors, or paying for items. Now you can’t leave without it.
That's save me a couple of times when I left home without my wallet and didn't realize it until I went to pay. Fortunately I had my phone and those places had ApplePay.
 
A pocket-patting habit does it for me. When I know I've my car keys and phone I can go anywhere and do anything.
Don’t forget your wallet, lol. I learned from friends who alway say, “keys, wallet, phone” whenever they leave.

And like you, I pat my pockets. If I’m just taking keys and Apple Watch, the watch gets taps for wallet (Apple Pay) and phone (LTE).
 
Don’t forget your wallet, lol. I learned from friends who alway say, “keys, wallet, phone” whenever they leave.

And like you, I pat my pockets. If I’m just taking keys and Apple Watch, the watch gets taps for wallet (Apple Pay) and phone (LTE).
The slightly different trick I use is that I know it’s three items (or four in mask times), so that’s the only thing I need to remember. If it doesn’t add up to three when I walk out the door, then I forgot something.
 
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I set up a reminder that pops up before sleeping to remind me, since I use iPad way more than iPhone nowadays. Even sometimes going out to buy stuff. I tend to not bring the phone with me because iPad can do almost everything except phone call and sms.
 
Write a reminder somewhere on your body that you are bound to see before you leave home, like the back of your hand or your ding dong so you will see it when you go to the bathroom. Or tattoo it if you are hardcore.
 
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You might laugh but a friends dad always patted himself to confirm while saying, “Wallet, Phone, Spectacles (glasses) and Testicles” confirming that he was set to head out the door.

Kind of hard to forget once you’ve said it a time or two.
 
Write a reminder somewhere on your body that you are bound to see before you leave home, like the back of your hand or your ding dong so you will see it when you go to the bathroom. Or tattoo it if you are hardcore.
Your comment immediately reminded me of that fantastic film from 2000 called Memento, do you know it?

OP: Not directly associating this with you! Just love this movie. A more hard core solution to just scribbling a phone number on one's hand.
 
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