There could be any number of reasons why an iPad can't connect to WiFi while a phone can. The following are some possible causes and corresponding solutions:
IPAD cannot connect to the Internet causes and solutions:
Network delay caused refresh failure, you can try to turn on the airplane mode on the IPAD, wait five seconds to turn off, and reconnect to the network or restart the device.
The network Settings may not be correctly configured. Contact the carrier of the mobile phone card to obtain the Internet access Settings data and set them as prompted.
If you are connected to a wireless network, check that the WiFi password entered on the IPAD and the Internet access Settings on the wireless router are correct. You can also try deleting your WiFi password and re-entering it, or restarting and reconfiguring your wireless router.
Tablet cannot connect to WiFi at home Solution:
There may be IP address conflicts, assign a fixed IP address to each device in the router to avoid conflicts.
Check whether the system network Settings are incorrect. You are advised to restore the default network Settings.
It is recommended to reset the WIFI domain name and password of your home router and try to search for and connect to WiFi. If you still can't connect properly, take the tablet to a place where WiFi is available to test connectivity.
If the tablet is still unable to connect and access the Internet, it may be the tablet itself, it is recommended to check whether the tablet is correctly configured or the WiFi module is damaged.
The wireless LAN of IPAD is not enabled. Just open the Settings and click the wireless LAN to connect.
If the network connection times out during the connection process, you should open the Settings of iPad, open the wireless LAN, and then ignore the wifi that appears. Finally, click on your own wifi, re-enter the password, and then connect.
If the above methods cannot solve the problem, it is recommended to contact Apple's official customer service for further help.