My iPhone is working very slow

Word ~ See if this helps:

Settings > Safari > Clear History and Website Data

...and then close Safari:

Close an app on your iPhone or iPod touch

...and: Restart your iPhone

Source:

Clear the history and cookies from Safari on your iPhone...

õ¿õ¬

Word ~ If you're using a VPN, try turning it off. Also restart your router and:

#7 Reset your network settings

õ¿õ¬

Word ~ What model of iPhone is it?...

Settings > General > About > Model Name

And what version of iOS is it running?...

Settings > General > About > iOS Version

õ¿õ¬