Wallet can be moved from one phone to another without closing payment channels and this can be achieved in the following way:
/storage/BLW/mainnet/encrypted.channels.bkp, if not then enable local backups in BLW settings and check again in a few seconds.
encrypted.channels.bkpfile to some place outside of phone, putting it to public places like email is safe becase snapshot file is encrypted.
/storage/BLW/mainnet/folder on a new phone and copy
encrypted.channels.bkpfile into it.
Restore Wallet, then allow file system access when prompted and finally close BLW after that. By doing this BLW would create an empty folder in the right place which you can then locate in file manager and copy
Restore Walletin main menu, then provide your mnemonic phrase. You should see “Wallet backup file is present” message if BLW can access
/storage/BLW/mainnet/encrypted.channels.bkpon a new phone.
Next: Recovering lost balance