If that did happen I wonder how much it would be to unlock them. ATM it's just under £10 GBP of IRL money to unlock a 4th sim. With 600 SimCash costing £9.99 and the price of the 4th sim being 515 SimCash. I think this is more than double the price for the 3rd sim so I think the unlock price would be well over 1000 SimCash or £20. (I don't know what each player's local currency is or what the exchange rate of SimCash to your local IRL currency is but I don't think it's affordable or practical for the majority of players.