How to Prevent Your Phone from Being Blocked
Method 1: Go to your phone's settings, then navigate to "Network Settings." Look for the option called "Network Search" and switch it to "Manual Mode." After that, go back into "Network Search" and wait until you see "China Mobile" or "China Unicom" appear. As soon as it shows up, exit the menu. Your phone should now have a signal, although the duration of this anti-jamming effect depends on the quality of your device. Note: Some phones only allow a 10-second window for signal recovery, but that’s usually enough to send or receive a text message (this method has been tested and verified). This approach works well with most smartphones.
Method 2: Press and hold the "Listen" and "End" buttons, then dial 139 244, 138 133, or 1980 7889. This is a commonly used code. Many schools haven’t updated it yet, so you might want to give it a try. However, keep in mind that high-level testing equipment can detect this method and trigger an alarm.
Method 3: This technique has a more limited application. It involves using Bluetooth to make your phone functional. If you just need to transfer files, you can turn on Bluetooth and send them. However, this is only suitable for short-range file transfers. If you have Bluetooth messaging software installed, you can also send messages through it.
**Questions About Phone Blocking**
**How to Check if Your Phone Is Blocked**
When checking whether your phone is blocked, don’t rely solely on the number of signal bars. Sometimes, the signal strength can be misleading and doesn’t reflect the actual communication status. Don’t jump to conclusions too quickly. Instead, try making calls intermittently. You can dial a local toll-free number or a landline. If the call drops, it may indicate that your phone is still within the blocking range. Otherwise, it could mean you're out of coverage.
**Can Cell Phone Signal Blockers Block WiFi?**
Yes, modern full-range mobile phone signal shielding devices can block 2G, 3G, 4G, and even Wi-Fi signals. These devices are designed to cover multiple frequencies, including 2.4G Wi-Fi routers, without affecting mobile phone signals. This feature is often added based on user demand.
**Which Signals Can Be Blocked by a Cell Phone Signal Blocker?**
Current signal blockers can shield various networks, such as GSM (Mobile 2G/Unicom 2G), TD (Mobile 3G), CDMA (Telecom 2G), CDMA2000 (Telecom 3G), WCDMA (Unicom 3G), DCS (1800MHz), CDMA (1900MHz), 4G (China Mobile TDD-LTE), Wi-Fi (Wireless LAN), GPS (satellite signals), and more.
**What Is the Difference Between a Signal Blocker, a Cell Phone Shield, and a Cell Phone Signal Blocker?**
There is no real difference between these terms. They are all used interchangeably to describe the same device. A mobile phone signal shielding device is also known as a shielding device, a cell phone shield, a signal jammer, a phone blocker, a signal isolator, or a radio signal blocker. The terminology may vary, but the function remains the same.
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