What should I do if I am locked out of my mobile access? Please contact 3Rivers at 800.825.3641 option 1 for assistance. Have more questions? Submit a request 0 Comments Article is closed for comments. Related articles I forgot my password for Mobile Banking. How can I reset it? Why is my 3Rivers debit or credit card being declined? How to set the PIN on your Mastercard. What is 3Rivers routing number? What are my sign-on ID and password for the new mobile app?