I have internet service on my iPad and personal hotspot too and everyday it disappears . Tells me to hook up wifi
How do I get my iPhone internet and hotspot to stay with my iPad. I pay for the service
iPad Air, iOS 12
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Assuming that both your iPad and iPhone are both signed-in to iCloud with the same AppleID, verify that your iPad is configured to automatically join your iPhone hotspot:
Settings > WiFi > Auto-Join hotspot - set to Automatic
Note that your iPad will only join the hotspot if (a) the iPhone is within range - and (b) the iPad cannot detect a configured WiFi network.