Hello. I recently received a UMX U673C phone with Assurance Wireless, a service for poor people that is carried out by Virgin Mobile. Sometimes such service is referred to as "obamaphone". Everything was nice, however my phone constantly offers me to install new apps. I suspect that the program that is responsible for this is Google Play. A message that pops up has an "X", however when I hit this "X", the app still installs and I have to uninstall it. Over time, those installations lead to another problem: annoying spam ads that pop up on my phone screen every time I turn the screen on. Here you can see who sponsors those adds. How do I get rid of those two problems and restore the usability of my phone? I tried to change the ad settings in Google play, that did not work. I am looking for ways to block ads. I am also looking for ways to override Google Play, prevent app from installing unless I key in a secret combination or do something else to give an app I want to install a special permission to do so. Thank you.