Originally Posted by
mlin32
I don't understand what you mean. I've only had dual SIM card (physical card) mobile phones for years and it's never an issue to have my Chinese SIM and a German one both in the phone at the same time. Of course, data usage is drawing from the chinese SIM in China.
Newer iPhones marketed in North America, Japan, Middle East and other places have gone SIM card slotless. The next generation of iPhones in Europe is expected to be slotless as well.