If you suspect that your spouse has another SIM card, you’ve come to the right place. There are many ways to find out if your spouse has two phones. First, you can see if your spouse has a separate phone by looking at its screen. Unfortunately, not all cell phones have this feature, including iPhones. However, you can use the phone’s phone number to check to see if your spouse is using a different number or special apps: https://celltrackingapps.com/spouse-has-another-sim-card/