Gadgets 360 With Technical Guruji: Ask TG [September 2, 2023]

I keep getting rolling black bars on my phone screen while shooting a video. Is there a problem with my camera and how can I fix this issue? Which smartphone has the best camera for astro-photography? I'm thinking about getting the iPhone 15 when it launches, but I'm unsure about the price. How much would an iPhone 15 cost at launch? I've never used the NFC feature on my phone, but I want to know its real-world applications. Is the feature safe to use?