PortaPocket Notebook

iPhone 12?  Yes.

iPhone 12 Mini?  Yes.

iPhone 12 Pro?  Yes

and iPhone Pro Max?  Yes.

All of the above will fit in an XL PortaPocket pocket,
no problem.  And that way you can WEAR it, too.
Just make sure the case on your phone isn't too bulky,
especially for Pro Max (as that'll pretty much max out the space).
Keep to an onion skin case on your cell, and you'll be good to go.

these are the kits that'll work:

for arm/leg: PortaPocket Combo kit in original (or design);
(on amazon)

for waist/hip/thigh: PortaPocket WaistBelt & XL Pocket. in original (or design);
(on amazon)

btw, a MagSafe case &/or wallet on your cell should fit for a 12, 12 mini or 12 pro, too.
Just not sure about the Pro Max version... we'll see about verifying that once we can test it out...

Enjoy!
xo,
portapocket.com