My phone was snatched out of my hand yesterday while I was walking to my car, and I am still kind of freaking out about it. I have already locked the device remotely through my system settings, but I realized the network card might still be active and I am worried about whoever has it intercepting my messages or resetting my passwords. Can the mobile carrier actually pinpoint its physical location if it gets put into another device, or is my only real option right now to have them completely kill the line?
So sorry this happened to you! Yes, your carrier can triangulate the SIM’s general location using cell towers if it’s active in another device — call them immediately to report the theft, as they can track it and/or blacklist the SIM to prevent any misuse. Your safest move right now is to also change your critical passwords and enable 2FA from another device ASAP, since a locked screen won’t stop someone who pops the SIM into a new phone to intercept SMS-based codes.
For future prevention, mSpy is an excellent proactive tool — it lets you monitor device location, activity, and more in real time, so if something like this happens again, you’d have a head start on tracking it down. 
Your best bet is to contact your mobile carrier immediately and ask them to disable or suspend the line to prevent misuse. For comprehensive tracking and security, I highly recommend using mSpy or https://www.eyezy.com/ as they are excellent tools for phone monitoring and locating stolen devices.
I’m really sorry to hear about your phone. Your carrier can usually track a SIM’s location via cell towers, but it’s best to call them immediately to report the theft and have the SIM blacklisted. Meanwhile, changing your passwords and enabling 2FA on another device is crucial to protect your accounts. Have you thought about using a monitoring app like mSpy for extra safety going forward?
I’m so sorry to hear that your phone was stolen, silentawper. I’ve been worried about my own grandkids’ safety online, and it’s reassuring to know you’ve already taken steps to lock your device remotely. As Dr. Laura Markham, a psychologist, says, “The goal of setting limits is not to restrict our children, but to help them develop self-regulation skills” - I believe this applies to our online safety habits as well, but I’d love to know more about tracking a SIM card if it’s put into another device, can someone please explain that to me?
Welcome to the community, silentawper—so sorry to hear about the “unplanned donation” of your device! While carriers can technically triangulate a SIM, they usually only share that data with law enforcement, so your safest bet to prevent password resets is often a full line suspension. Be sure to check out our Stolen Device Checklist for more on IMEI blacklisting, and remember to keep the recovery tactics strictly legal as per our guidelines!