Sep 10, 2017 - 11:13 PM
in reply to Pickergal
>> when they install the sim card in our phone will we lose our contacts
I'm no expert on this, but this is what I understand from my own experience with several phones, SIM cards and SD cards. The phones I have experience with do not include an iPhone.
If your contacts are stored on your SIM card, and the SIM card is replaced, then you will "lose" your contacts until the original SIM card is put back into the phone. Before changing the SIM, copy your contacts from the SIM card to the inbuilt memory on the phone, and they should then remain available after the new SIM goes in.
>> any downloaded books and downloaded documents from our phones?
Usually those things are not installed on the SIM card, but rather on an SD card (if you have one installed) or to the phone's own memory, so changing the SIM card should not affect them.
However, to be on the safe side, I would back up your contacts and other data on your phone before leaving home, and have a copy of your key contacts in another form, e.g. on paper.