After logging into the mobile application, advertisements promoting other Bank of America services are frequently displayed prior to allowing navigation to account information. These ads command the entire display and are consistently annoying and intrusive. If attempting to switch to a linked BofA account, these advertisements sign you out of the mobile session, and this loop continues to repeat itself, regardless of whether you click the "x" in the upper right corner of the display or click "Remind me later." This has occurred on dozens of occasions, across different BofA "campaigns." It is incredibly annoying and is awful user-experience design. There are other aspects of the mobile app that are quite useful, but this annoying advertisement behavior knocks 3 stars off the app.