The cause of an “UNSUBMIT” transaction, might be one of two:

1. Bad network connection
2. The Ethereum network is clocked by a high number of transactions.

How to resolve and successfully submit the transaction:

1. Check if the mobile phone network is smooth and try to switch your network to WiFi or 4G
2. Find the corresponding transaction on the “Transaction History” page, and click “Resubmit”

After the transaction is successful, the status will update to “Pending”