Here is a short video on how to log in to your GCash account using a device you've used in the past:
You can easily log in to another GCash Account in just a few steps.
If you have already logged in to the GCash Account you wish to log in to using the same device in the past, follow these instructions:
STEP 1: Launch your GCash App then tap Change Number on the Login Screen
If you are currently logged in the GCash App, tap profile and then log out
STEP 2: Tap Yes on the Pop-up Screen
STEP 3: Key in the GCash-registered number you want to log in to, then tap Next
STEP 4: You will be redirected to the Login Screen and you can log in using the MPIN of the GCash number you entered.
Here is a summary on how you can log in to another GCash account using a device you have used in the past: