Log in to your Sinbad wallet
Click on Add money
Select USDT as Deposit method
Copy your Polygon address from Sinbad
Go to Step 2
Log into your Phantom wallet
Ensure you have a USDT balance.
Click on Send
Select USDT
Enter the amount you want to withdraw then Paste the Polygon address you copied in Step 1 above.
Click Send
You’re done! After a few minutes, your Sinbad wallet balance will show your the transfer.