I found connecting to the iOS hotspot - and remaining connected a real problem. So much so that I wrote a procedure:
This is a fiddly process and it must be done in this order each time!!
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Phone Settings - turn off mobile hotspot
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RS3 - Turn on RS3
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Phone Settings - Connect to RS3 WiFi Hotspot
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Emlid Flow - Choose RS3 from list of available devices - preferably WiFi not Bluetooth
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Emlid Flow - Settings → WiFi → Enter name and password of mobile hotspot or click connect to an already entered mobile hotspot
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RS3 - Power off
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Phone Settings - Turn on Wifi - ensure you are not connected to any other WiFi networks
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Phone Settings - Turn Mobile Hotspot ON and set Maximise Compatibility ON. Leave Hotspot settings open
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RS3 - Power On
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Emlid Flow - You should see RS3 connected - choose it - now configure settings for job.
This process works…but it’s such a pain, and has to be repeated if the connection drops, that I went out and bought a mobile WiFi router. That allows all devices - including drone controllers and Reach devices - to be on the same network. It works pretty well, though Emlid Flow loses connection if you let the iPhone lock. Then you have to restart Emlid Flow to get a connection.
HTH.