Changing Out a SIM card from one iPhone 5s to another used iPhone 5s
My company gave me an iPhone when it came out. I use an 11 personally. Mine is getting old and one of the guys gave me his, that he never used, both iPhone 5s's. I changed out the SIM card but all the info comes up as his. He gave me his code to get into the phone. I just do not know what to do for this new iPhone to recognize my SIM card? I just want to see my information with my SIM card in the newer phone.
Thank you for the time and Happy Holidays.
iPhone 5s, iOS 12