Is all your phone data really siphoned at airports?

I know this is old but I have answers with a source lol. They do MITM attack through a fake cell tower and that way they could put malware on your device or download data. My source is the Netflix documentary series Spycraft chapter 4 (Clandestine Collection) at around minute 12 ish. They specifically talk about phones on airports. But this probably is old and phones are more secure now but not sure on that. You could use airplane mode.