Did you try the reset of the network settings or reboot the phone?
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Reichela, it is a known issue that the newest iOS update has been causing some troubles. First I would try to rectify your connection by following these steps: Settings > General > Reset > Reset Network Settings. This will reset Wi-Fi networks and passwords, along with cellular, VPN, and APN settings. If iOS 11 is still giving you trouble, you can always reset your iPhone to its factory settings by going to Settings > General > Reset and tap Erase All Content and Settings. Just make sure that you back up all your precious files first as this will wipe your iPhone completely.
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