Hi Lou
You will be able to connect both Android and iOS to the radio but only one at a time.
There are not as many features on the iOS due to restrictions sorry to say.
You can copy and swop the memories as they are stored on the radio if you set it up correctly and not to over right.
My iOS is now too old and if I remember the BT audio doesn't work on iOS.. so a BT speaker Mike may be an answer if you don't want to use a screen while driving.
It's a no no now in UK to touch or look at a screen while driving or even stopped in a vehicle...heavy fine and points...
Hope that answers and points you in the right direction, let us know how you get on.
Min Standen G0JMS