Q: iPhone keeps losing wifi connection although there is no problem with the service provider. Reset everything still no joy!

Hello Jess-scott,

Thanks for visiting Apple Support Communities.

It sounds like your iOS devices are not staying connected to your wireless router, but your Mac is staying connected. You mention that you've tried resetting the router and devices, which is a good troubleshooting step.

You may also want to try resetting network settings on one of the devices by going to Settings > General > Reset > Reset Network Settings. If this step solves it, try it on the other devices.

You can find this step in the article If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network.

Since the Mac behaves normally, but iOS devices don't, you can also verify the settings on your router against the recommended settings for iOS devices in this article:

iOS and OS X: Recommended settings for Wi-Fi routers and access points - Apple Support

Best Regards,

Jeremy