1. Get the PUK code from the SIM card packaging. When you purchase a SIM card, it comes in a little package, and the PUK code should also be included in it. If you still have the package, look for the plastic card that the SIM was snapped out of. The 8 digit PUK code should be printed on the back, together with the SIM PIN code. Look up your IMEI to see if your phone is compatible with the T‑Mobile network using our checker tool below. Every phone has a unique number—15 digits that tells you the make, model, and if it’s ready to use on our network. Most phones are compatible. IMEI STATUS CHECK: Dial *#06# to get your phone's IMEI, or find it in phone settings. In case our phone is lost, then someone else can take our sim for bad purposes. So you need to set up SIM card lock to protect SIM, you need to enable SIM PI SIM registration information. Click on Settings. Scroll to select security. Click on configure SIM card lock. Click on the lock “SIM CARD”. Insert the default PIN code of the MTN SIM card. The default code is 0000. You will need to change the SIM card PIN code in order to replace the default PIN code. Confirm your new PIN code. Start by opening the “Settings” app on your mobile device. It is usually represented by a gear icon. Scroll down and find the “Security” or “Lock screen” option. Tap on it to access the security settings. Look for the “SIM card lock” or “SIM lock” option. In 3 simple steps, fast, safe and permanent. SEARCH FOR YOUR PHONE MODEL. Full Guarantee. 100% legal, doesn’t void the warranty, no software installation required. Customer Support. Available 24 hours a day by telephone, chat and e-mail. Safe and Easy Payment. Fully secure whether by credit card, PayPal, in cash or by bank transfer. Google Fi Wireless Simply Unlimited Talk/Text/Data SIM Kit - 1 Month. (23) $33.00. $50.00. Boost Mobile - 3 Months 5GB Plan SIM Card Kit. (323) Google Fi Wireless Unlimited Plus Talk/Text/Data SIM Kit - 1 Month. (35) Mint Mobile - Unlimited Phone Plan - 3 Months of Wireless Service. 7. You Can Only Use a Specific Carrier's SIM Card on a Locked Phone . When getting into the world of SIM cards, you need to get acquainted with two terms: "locked" and "unlocked." These two terms dictate which SIM cards you can use on a phone. A "locked" phone can only use SIM cards from specific carriers. Here is the step-by-step guide to getting your Vi SIM blocked through the Vi-Store. Step 1: Visit the official Vi-Store Locator to find the nearest store. Step 2: Go to the store. Step 3: For OTP verification, the executive at the store will ask for an alternate mobile number or email ID. Step 4: After the OTP verification, your lost SIM card In the Settings app, tap Carrier Cellular Plan Ready to Be Installed. Tap Continue, at the bottom of the screen. Make a call on your iPhone to check its cellular connectivity. If you can't make a call, contact your carrier. If the plan you activated replaces the plan on your physical SIM, remove your physical SIM. Then restart your iPhone. YqKYC.