I suspect that my phone is being monitored by the NSA. Is there any way to avoid it?

First of all, you should know that all modern smartphones are vulnerable to attacks, we have written a lot of articles on them, and there is no 100% reliable way to protect them. The only way to make your smartphone safe is to make hackers useless. Just don't store any sensitive information here, that's it. The GSM protocol also has several serious security vulnerabilities because it is outdated and cannot withstand modern threats. Therefore, all you have to do is to avoid keeping important data on your smartphone, stay away from free public Wi-Fi networks, and pay close attention to the installed applications. Malware can be found on devices running any operating system. Another way is to buy a portable cell phone jammer, so that you can prevent others from monitoring.