My wife and I are headed to England soon. One iPhone (call it phone #1) will be equipped with a UK SIM upon arrival (done this many times; very cheap way to go, especially if using a lot of data). The other phone (phone #2) will retain its US "identity," i.e. it will keep its US SIM and, thus, its US number.
It is my understanding that if someone in the US dials the number associated with phone #2, phone #2 will still be "found" by the network and the call will be delivered normally. What I do not know is whether either the calling party or the called party (the owner of phone #2) will incur any extra charges for such a call above and beyond whatever our Verizon plan provides for (which is unlimited calling in our case). Can someone please advise?
A related question: we plan to forward the number associated with phone #1 to phone #2 before we depart. By doing so, we expect that any calls placed to phone 1's US number will ring on phone #2 in England. Am I correct?