how do get my iphone back online

Hello camryn232,

Thank you for using Apple Support Communities! I understand from the information you provided that you’re unable to find your iPhone, it shows offline; I'd like to help.

The following support article provides some troubleshooting steps to try for this behavior:

If Find My iPhone is offline or not working - Apple Support

If this is not the issue and your iPhone can't connect to the internet, these articles can help:

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support

If you see No Service or Searching on your iPhone or iPad - Apple Support

Hope this helps.

Best Regards.