Wifi
My daughters phone connects to the wifi but then it disconnects straight away but still can use iMessage and instagram
iPhone XR
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May be she is using Cellular Data for iMessage and Instagram.
Check your WiFi Router / Modem for --> Recommended settings for Wi-Fi routers and access points ...
Connecting to Wifi is the first part and then getting connected to the Internet is the second
- If you connect to Wifi, doesn't necessarily mean you are connected to the internet. If you are not connected to wifi could be a problem with iPhone settings or Router/Modem Settings
- If you are not connected to the internet is the sole issue of Router / Modem Settings. Contact your ISP immediately
For your Internet connection.
- Over Cellular: contact your Carrier (Cellular Service Provider). The agency who issued the SIM to you
- Over WiFI: Contact your ISP (Internet Service Provider), the agency who provided the Internet Service on your Modem/Router to you
However --> Connect iPhone to the Internet - Apple Support