How to reset the APN settings to default on my Google smartphone

Note:

Incorrect APN settings can cause issues with data services (e.g., email, web browsing) and with picture and video messaging (MMS). To resolve issues, you can reset the APN settings on your Google smartphone to the default APN settings that are programmed into your Bell SIM card.

Applicable to: Google Pixel, Pixel XL, Pixel 2 XL, Pixel 2, Pixel 3 XL, Pixel 3, Pixel 3a, Pixel 3a XL, Pixel 4, Pixel 4 XL, Pixel 4a.