How to fix terrible wifi connection on iphone 6?

my wifi connection is so slow. also my LTE is very slow.... help meeeee

Hello soomin924,
For troubleshooting Wi-Fi connections in general, please see
iOS: Troubleshooting Wi-Fi networks and connections
but this next article has settings to "help ensure maximum performance, security, and reliability when using Wi-Fi".
iOS and OS X: Recommended settings for Wi-Fi routers and access points
For cellular data help, check out
iPhone cellular data connection issues
A lot of reading I know, but some good information.
Best Regards,
Nubz

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