Dji go 4 will not work very well on an ipad mini 1 I recommend you getting a ipad mini 4 and make sure it has it sim network on it so you can have map access with you or you would have to download maps prior to it if no sim network and your out of range of WiFi
I run it on an iPad 4 and have no issues. For apple theyr’e relatively cheap considering iphone and samsungs are £600+. I would recommend the iPad. I’ve used android but there’s always niggles when I try to use that OS.
you shouldn’t have to pay for a plan its for the GPS which comes through the sim network as other tablets such as android or os without a sim network don’t seem to work well . Unless its states GPS built in. Its similar to a satnav in your car if this makes sense.
You made the right choice, I had an iPad mini 1 kicking about so I thought I’d try and use it with my MA2 but it’s basically a brick, I can’t load anything on it, it’s so out of date that no SW can be loaded, definitely nothing from DJI. It’s a shame as it still works!