How can I increase security on my smartphone or tablet? - U. S. Bank . . . Call us right away at 800-USBANKS (872-2657) if you have any concerns We accept relay calls How-Can-I-Increase-Security-on-My-Smartphone-or-Tablet Conditions Additional Information – Mobile Helpful Links Who do I call for help with mobile banking?> Is U S Bank digital banking secure?> Mobile Security page> Browse Topics