Also just rebooting your phone wont change your prl ypou need to pull the sim card let you phone boot up until it tyells you you neede sim the put it back in reboot and your phone will update to the correct prl depending where you are.
Perhaps I'm not quite getting exactly what you're saying because everything runs together, but pulling the SIM, booting up, letting the phone tell you to put in a SIM card, putting it in, and then rebooting won't trigger anything that just rebooting the phone won't trigger. Once the phone shuts down from the process you gave, the boot sequence is exactly the same whether you previously removed the SIM card or not.
Either way, the phone will automatically check for PRL updates on its own, so there's really no need to worry about it.