Hello chrisanthemum,
Are you having trouble connecting to the internet from your home wireless network, or from any wireless network? Great job on the troubleshooting you've already done. The resources below include these steps, and some additional ones to try:
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support
https://support.apple.com/en-us/HT204051
Try connecting to a Wi-Fi network in a different location. If your device can connect, you’ll need to get help with your Wi-Fi network. If it can’t connect to any Wi-Fi networks, contact Apple.
If you're connected to a Wi-Fi network but you can’t get online, try to use your Wi-Fi network on other devices. If you can’t get online using your other devices, there might be a service outage. Call your cable company or internet provider for help.
iOS and OS X: Recommended settings for Wi-Fi routers and access points - Apple Support
https://support.apple.com/en-us/HT202068
Wi-Fi: Unable to connect to an 802.11n Wi-Fi network - Apple Support
https://support.apple.com/en-us/ht204409
I hope this information helps ....
- Judy