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I have the private key QR code and 15 digit password from the original wallet...but am not sure how to access the BTC with it. According to what I read, as long as you have this and lose your phone you should be alright, so I imagine this would be the same process?
But when I reinstall the wallet, scan this QR code, and enter the password, it tells me my key doesn't match my BTC address (which is a new one bc I reinstalled the APP)
Just ignore the degens. If you have the private key as QR and the password you can do the following:
#1 hit menu -> offline wallet
#2 select qr-code
#3 scan private key.
#4 mycelium should detect it as encrypted private key and ask for the password
#5 enter password and wait for encryption (takes >1 minute on old phone)
#6 transfer funds to another of your addresses you still control.
#7 mycelium should warn you that it will not store the private key, so make sure to transfer the whole balance
I got that "does not match your key/address" error as well once, but I forgot how. IIRC you just took a wrong turn and "offline wallet" is the option you want even though it sounds wrong.