.... solution is more registration?
Solution is to switch them to Gemalto SIMs.
Because they already have major data centers in the US and want more of them closer to their customers in Europe?
Nope. These placements are being offered as bribe money in kind to lessen or totally eliminate the fines Apple should have to pay for playing a tax evasion shell game with their massive global profits.
If you really think these being placed in Ireland (Double Irish) and the Netherlands (Dutch Sandwich) just by sheer accident, you may be one of the most Pollyannaish fanboys queuing in front of the Chrystal Cubic Cathedral.
To the systems programmer, users and applications serve only to provide a test load.