MyCelium wallet import process:
Log in to your MyCelium mobile app
Go to “Accounts”
Click on Main Account
Copy the xPub key. The address should start with “xpub”
Enter the xPub key into the Blox wallet integration page under Bitcoin wallet.
A note on automatic update.
xPub keys will automatically pull in all prior and future transactions. Mycelium can generate new public BTC addresses for deposits, but these will be included underneath the xPub key.