I remember the first time I discovered this limitation. I was at a laundromat and trying to switch car insurance carriers. I had to walk around and find a random open WiFi signal to look up my bank account number while I was on the phone with the agent.
Then I never ended up going with them, and I have the same car insurance I've had since I've been able to drive.
In retrospect, finding a random access point to look up my bank account number seems like a pretty terrible idea. Fortunately, it was like 3 years ago, and I don't have that bank account anymore.