I am changing from my 5S to the 6S. After uploading all apps and going through set up, I must have missed something as I have no service on my new phone. Please help.
Welcome to iMore, Leo! Have you activated your new phone with your carrier? Usually this involves removing the SIM card from your old phone and inserting it in your phone. If you need help doing this visit this page: How to remove the SIM card in an iPhone or iPad | iMore
If this doesn't help I would contact your carrier or Apple Support. It could be a number of other issues either with your carrier or with the phone software or hardware.