Your mobile phone can work without a SIM card, so long as you are connected to Wifi. Doing this, however, will restrict you from being able to send messages or make voice calls due to not having a mobile number.

Once you have activated your SIM, you will be able to connect to a 3G, 4G, or even 5G network, depending on who you are with.

If you are wondering ‘how to check my sim is 4G or not’, we have created this easy guide specifically for you, so you can get the answers you are looking for.

What is 4G?

4G between 2G and 3G

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4G stands for ‘Fourth Generation’ which is the second latest network for mobile phones. 5G is already available for some networks, which is faster and more reliable than 4G.

4G is what you use to connect to the internet when you are not in a Wifi zone. 4G is quite fast, enabling you to get onto websites without having to wait ages for it to load, although this is dependent on where you are, if you are further away from a cell tower, the signal won’t be as good.

Your 4G on your mobile can lose signal, stopping you from getting onto the internet if you are in a well-insulated building, the weather conditions are grim or you are in an area out of coverage to your network provider.

How can I activate the 4G network

On Off Switch

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Generally speaking, when you’re looking to purchase your next mobile, you check to see what the specs are and what network you will be able to get.

If you have purchased a 4G enabled phone, and you have a 4G sim,  it will automatically connect and you shouldn’t have to do anything, although, there may be an odd occasion where you will need to activate it yourself.

On Android

Step 1. Access your ‘Settings’ from your home screen

Step 2. Select ‘Mobile Networks’

Step 3. Choose ‘Network Mode’

Step 4. Click on 4G/LTE

On iPhone

Step 1. Go to ‘Settings’

Step 2. Select ‘General’

Step 3. Choose ‘Cellular’

Step 4. Click on 4G

Your 4G has now been activated manually.

How to Fix 4G not working

Screwdriver and nails fix

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You have a 4G sim, however, it is not working even after you have manually activated the 4G network on your mobile.

Here are easy fixes that should sort out this issue for you;

Fix 1. Restart your Mobile

As with most malfunctions, a quick reboot of any device can sometimes do the trick when fixing some sort of error

On Android

Step 1. Hold down the ‘Power Button’ of your phone

Step 2. Select ‘Restart’ or ‘Power Off’ if you do not get the restart option

Step 3. Turn your mobile back on

On iPhone

Step 1. Click on the volume button and the right-hand side button together  for a few seconds

Step 2. Toggle the ‘Power Off’ button

Step 3. Turn your mobile back on by holding down the button on the right

Your mobile has now been restarted.

Fix 2. Switch airplane mode on and off

Turning your airplane mode on and off causes your phone to refresh and reconnect to a network, which will get your phone to connect to a better network than what it was previously connected to.

On Android

Step 1. Go into your ‘Settings’

Step 2. Select ‘Mobile Networks’

Step 3. Switch airplane mode ‘on’ and leave on for a minute

Step 4. Turn airplane mode back to ‘off’

On iPhone

Step 1. Go into your ‘Settings’

Step 2. Enable ‘Airplane Mode’

Step 3. Wait a minute before turning airplane mode back off

Note, ensure your 4G network has been switched on before switching on your airplane mode.

Your mobile will now reconnect to a network.

Fix 3. Check for an available software update

Your mobiles software is continuously being updated to fix any bugs and issues that arise with the current software installed on your device.

Updating your software will improve the performance of your mobile, so if you are experiencing your 4G not working, it would be a good idea to check to see if your phone is due an update.

On Android

Step 1. Go into your ‘Settings’

Step 2. Select ‘System’

Step 3. Choose ‘Software Update’

Step 4. Click on ‘Check for Updates’

If your mobile is due an update, it will give you the option to update.

On iPhone

Step 1. Go into ‘Settings’

Step 2. Click on ‘Software Update’

Step 3. If your iPhone is due an update, it will give you an option to update here. Click on this if it is available.

Your mobile device will now have the latest software installed.

Fix 4. Reset your Network Settings

Resetting your network settings won’t lose any of your other desired settings on your mobile. This fix is simply to remove any saved settings your phone had when connecting to a network, allowing it to connect again, on a 4G network.

On Android

Step 1. Go into your ‘Settings’

Step 2. Select ‘System’

Step 3. Click on ‘Reset Options’

Step 4. Now choose ‘Reset Network Settings’ and then ‘Reset Settings’

Step 5. It may ask you for your pin to confirm the reset.

On iPhone

Step 1. Select ‘Settings’

Step 2. Choose ‘General’

Step 3. Click on ‘Reset’

Step 4. Select ‘Reset Network Settings’ and enter your pin if requested to

You have now successfully reset your network settings.

Fix 5. Remove and Reinsert your Sim

Removing your sim card from its slot and reinserting it can sometimes fix your 4G not working as an accumulation of dust in the insert tray can interfere with your sim card working properly.


Even though your mobile device can operate without a sim, it’s important to have one so you are able to stay in contact with your friends and family for when you aren’t connected to Wifi.

With 4G being one of the fastest networks to be connected to, it’s no wonder you would want to make sure you can connect to a 4G network.

With this guide in place, we hope you have been able to check if your sim is 4G or not, and if you had any trouble with connecting to 4G, you were able to rectify it.