Q: My iPhone 6 has network fluctuations

Hello iparmanand,

Thank you for using Apple Support Communities. 

Your question is a bit unclear, what is meant by "network fluctuation problem"? Assuming you are talking about a Wi-Fi connection issue, you can start with this support article: If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network 

If this isn't your issue, please let us know and we can try something else. 

Best regards.