Just to confirm settings and networks added in Metamask can be synced to another device only if that device has a camera lens to scan the QR code?
I think there are multiple options provided by new wallet better than MetaMask in "
sync settings" between several devices.
But if you want to synchronize the best option:
Download Metamask on your phone first, save seed then import it to wallet browser extension using seed.
Generally, wallets are designed for privacy and offline private key generation or connected to more than one device so using your same seed in several devices will increase the risk of loss of currencies.