I have now gone through 2 Revos that both required a master reset. The first due to BT issues and the second due to hotspot issues. Both times the master reset fried the sim card making it unable to read. Even a sim replacement would not work. I really liked this phone, but not being able to consistently use its features is a deal breaker. Best Buy has been great. They changed me out of the Revo and into a Charge tonight. Hopefully that will get it done.