I removed all apps. Factory reset my phone.I didn't sign into my email, play store, internet nor did I let google reinstall my contacts. So nothing on my phone. Yet ads popped up and apps downloaded to phone.
Some of them yes. Most seem to be from the playstore.there seems to be a couple factory installed apps that may be the cause. alarm controll er and app market. But can't uninstall them. I will try your suggestion and see if that works