I didn't think that the iPhone stored contacts on the sim card. If that is the case, you should back them up to iCloud then they will be with your iPhone regardless of what sim card you have.
I didn't think that the iPhone stored contacts on the sim card. If that is the case, you should back them up to iCloud then they will be with your iPhone regardless of what sim card you have.
yes, have them all saved and synced though icloud. as long as your apple ID is logged into the phone, you will have your contacts. when i went to iceland, i was easily able to swap SIM cards and not lose any contacts since i use icloud.