Sleek World SIM is an international roaming SIM that will allow you to save while you stay connected overseas. 

The service is prepaid so you do not have to worry about a bill shock again.

This SIM is set to automatically connect to our strongest supported network in the country you are travelling to. This will ensure that you have the best connection possible at all times.

With cheap call, text and data rates you can feel safe knowing that you can stay in contact while travelling.

You can order your Sleek World SIM online on our website.

Click on the buy option on the main page to purchase a Sleek World SIM card for your device.

Once ordered, we will dispatch you a World SIM. You will need to activate the World SIM that you receive online before being able to use it.

You will be receiving a new phone number with your Sleek World SIM. 

This number will always be a UK based number starting with +44. 

You will receive this number after you have finished activating your new SIM. 

This number will be sent to you in an email and also as a text message to your phone when you insert the Sleek World SIM for the first time.

You can also retrieve this number at any time by doing the following:

  1. Insert the World SIM into your phone 
  2. Dial *133#  
  3. Your World SIM phone number will be displayed on your screen and also sent to you as a text.

We recommend that you activate and test the SIM in your device in before you depart.

When you receive your Sleek World SIM

Insert the SIM in your device and ensure that you are able to complete the test call by dialling *222#. After this step, re-insert your normal SIM until you depart.

This means that if you are experiencing any issues or your handset turns out to be network locked you have plenty of time to unlock the device or contact us for support.

After the SIM has been activated it will be active as long as you keep using the SIM once every 90 days. If you leave the SIM unused for more then 90 days it will automatically deactivate

You can top-up online, via phone or by setting up auto top-up.

Top up online by logging in to your online account and select add credit. 

To top-up over the phone, call *200# to reach our support team

To set up your account with our automatic top-up service, please log into your account. Once logged in, you will be able to nominate the amount you wish to automatically top up, designate a credit card and set the end date you wish for it to stop.

If you have more than one service on your Sleek World SIM account, you are able to pool your credit so that all devices linked to your account will share the same amount of credit. 

This means that you will only need to worry about topping-up one balance that all of your services can share.You can easily turn on/off the pool credit option online in your account. 

When you pool your credit to one main SIM, the balance on all of your other SIMs will show the balance of your main SIM. If your other SIM cards have individual balances of their own, this will not show in your account until you turn off credit pooling. 

Tip: To make the most our of your credit, make sure you transfer credit from your other SIM cards to one main SIM. This way you will be able to access all your credit and only need to top-up one number. 

Note: you will only be able to pool and un-pool your credit by logging into your account and not your individual SIM

Your Sleek World SIM will continue to be active, as long as you do not leave it unused for more than 90 days.

This means that you must use your World SIM at least once every 90 days to keep the SIM and credit active.

All mobile phones will have the + button however, some will have it as 0 or *. All you need to do is hold down the 0 or * button for 3 seconds to retrieve the + symbol.

The first thing you should check for is data roaming. You should ensure that you switch data roaming OFF when you are not using it, as you will still get charged for data every time you use a data service such as incoming emails or notifications.

To switch data roaming OFF

On an iPhone:

Step 1. Go to Settings on your iPhone

Step 2. Scroll down to find Cellular 

Step 3. Switch 'Data Roaming' OFF

On an Android:

Step 1. Go to Settings on your device 

Step 2. Find Wireless and Networks 

Step 3. Then click on Mobile Networks 

Step 4. Look for Data Roaming and untick the option

Using all other mobiles:

Step 1. On the main Menu of your device, find Settings

Step 2.  Look for the option Mobile Network or Connectivity

Step 3.  Scroll down until you can find the option to switch Data Roaming OFF. 

If you cannot find the Data Roaming option on your device, you are also able to log into your account and switch data roaming on and off.

Note: If you are using an iPhone, you may also be incurring charges related to iMessages and/or FaceTime. You should switch both of these OFF in your settings when using your World SIM.  This can be found in Settings > Messages > iMessage and Settings > FaceTime.

The data rates will depend on the country that you are travelling to. 

Please note that we do not support data in every country that we allow calls and texts. 

Data rates are displayed by per MB basis however, we will charge your account per 10KB to help reduce any credit wastage. 

You can also purchase data packs for your data needs, these will help you save even more. 
We recommend that you test your Sleek World SIM before you depart by performing a test call. To make a free test call, you can dial *222# with your Sleek World SIM inserted. 

Step 1. Insert your Sleek World SIM
Step 2. Dial *222# and hit the call button
Step 3. Your phone will disconnect and will start ringing in a few seconds
Step 4. Answer the callback and you will hear a successful test call message

We have SIM cards that fit most of the phones available on the market.

However, as some foreign networks may run on different frequencies, you need to check whether your phone will be compatible specifically with the countries that you are travelling to (we recommend that you go through this step if you have an older/more basic phone).

In particular please contact the Support team if you are travelling to Japan or United States, as those countries require a newer handset due to their specific frequencies.

Our Sleek World SIM support team is happy to check this for you – please give us a call 

When purchasing a top up you will have the option to apply this credit to a SIM immediately or to receive a voucher code. You can opt to receive a voucher code if you have not received your SIM yet.

Once you purchase the credit you will receive an SMS and/or an email with the voucher details. You should keep your voucher number in a safe place as you can only apply this once. Note that this voucher is non-refundable. 

To apply this voucher: 

Step 1: Log in to your account online 

Step 2: In the main account dashboard you will notice a box with your unallocated purchases.

Step 3: Select which type of voucher you have purchased from the options.

Step 4: You can now allocate that voucher to a SIM of your choosing.


Note: If you cannot see your unallocated purchases, please select the SIM that you wish to use your voucher on. You will see an “Add Credit” menu at the top of your ‘My Account’ area. You will then see a tab “Use Credit Voucher”. Select the tab and paste in your credit voucher code.

On iPhone:
Step 1. Go to Settings
Step 2. Select Carrier
Step 3. Switch automatic OFF
Step 4. Once the network list is loaded select one of our supported networks
Step 5. Make a free test call to *222# to test that it is working

On all other mobiles:
Step 1. Go to Phone Settings
Step 2. Go to Mobile Networks or More Settings
Step 3. Find Network Operators
Step 4. Search for networks
Step 5. Once the network list is loaded select one of our supported networks
Step 6. Make a free test call to *222# to test that it is working