Causes and ways to fix iPhone does not turn on 4G

In 2017, users of Vietnam mobile networks have had the opportunity to experience high-speed 4G network and by 2018 this 4G is the most popular technology today. With 4G networks, users can connect to high-speed Internet to listen to online music, read online newspapers, surf Facebook or chat for free through OTT applications. However, in the process of changing to a 4G sim card, registered users may encounter 4G sim error not connected to the internet? So what is the cause and how to overcome this situation? Please refer to the article below with Network Administrator offline!

1. How to register for 4G sim student package Viettel, Mobifone and Vinaphone
2. How to register 4G Viettel package for Facebook and Youtube
3. How to check phone, SIM Viettel, current position supports 4G or not

1. Not 4G sim

This can also cause you to be unable to use 4G because not yet registered, how to use it. Please contact the operator to check if I have registered 4G. If your subscription is not registered for 4G, you can see how to register for 4G Viettel plan.

2. Not installed 4G on iPhone

If your SIM is a 4G sim and still cannot connect to the network, it is likely that your phone has not switched to 4G network mode. To know how to turn on 4G for iPhone, you can refer to the article How to enable 4G on your phone.

3. Mobile network data error

Mobile network data is where the network settings are stored on the phone. For some reason there is an error here. Please reset mobile network data by:

Step 1 : Go to iPhone settings, select General settings .

Step 2 : Scroll down to the bottom of the screen and select Reset .

Step 3 : Now you continue to choose Reset network settings so you have switched 3G to 4G network already.

4. Your Sim failed

It is possible that your Viettel 4G sim is experiencing some error that cannot receive the sim on the phone or the sim lost the wave completely. The hypothesis for you is to equip a new 4G Viettel sim right to be able to stabilize using the most convenient 4G network.

1. How to check if 4G current position is available?

5. Causes by geography

If your SIM has registered for 4G, the phone has also switched to 4G network and still cannot use the network, it is very likely that your position is the area without 4G coverage. 4G networks are not everywhere with 4G Viettel, so check or call the operator directly to find out where you are with 4G coverage or not.

6. Your iPhone is iPhone Lock

1. SIM pairing 4G is locked on iPhone lock in Vietnam - Users should be careful!

Next is your iPhone is iPhone lock (iPhone network lock). The use of the old paired sim could not enable 4G waves on iPhone lock devices. If your phone is iPhone lock and you want to use 4G sim, please bring to the store specializing in iPhone portable products for reinstallation support.

7. Hardware error

Finally, when you have checked the above conditions but cannot fix them, you should bring the product to the service center or the place of purchase to receive technical support.

See more:

1. How to change SIM 4G Viettel at home, only 30 seconds, free, can exchange
2. Instructions on how to activate 4G on the phone
3. Things to know about 4G networks