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21. How To Use Questions
    • How do I make a call using OneSimCard global cell phone service?

      To make a call:
      • Dial 00-CountryCode-AreaCode-Number and press the TALK/SEND button.
        Example: To call OneSimCard Support in the USA you would dial 00 1 617 3138888 and press TALK/SEND.
      With Europe & More SIM that does not use the callback to make a call, you will just get connected.

      With OneSimCard Plus SIM or Expedition (formerly Data & Roam) SIM:

      After pressing the TALK/SEND button you will see a variable message on the screen (for example 'Wait for call') which you can ignore and your phone will ring back in a few seconds. Answer this ring as you normally would answer any incoming call. Your call will then be connected.

      If you are unsure about how to properly dial an international number, follow this link for detailed country by country dialing instructions.
22. How To Use Questions
    • How do I check my OneSimCard balance?

      Just dial 099 "Send" from your OneSimCard phone and in few minutes the balance will be displayed on the screen of your phone. Customers with iPhones can use OneSimCard Assist app to check balances and many other things.
      You can always check your current balance by logging onto your OneSimCard account at www.onesimcard.com.
23. eSIM
    • Do I need to have Data Roaming turned on for eSIM to work?

      Yes. Data Roaming should be turned on on your  phone for eSIM for data to work. Calls and texts should work with or without it.
24. Troubleshooting Questions
    • When I try to make a call, I get a message 'Call is modified and cannot be made'. What does that mean?

      Some phone models do not allow direct dialing with older OneSimCard SIMs sold before January 1, 2017.

      To get around this problem, you should try either of these methods:
      • Locate the OneSimCard menu on your phone. (Some phones have it in Applications.)
        Make a call using menu 'Call'.
      • You can also make a call by dialing directly *146*00 Country Code Number#
        For example, to make a call to the USA, you would dial *146*0018574440686# (do not forget to hit pound at the end of the number)
      * is a star character located on the keypad
      Other examples of how to use th *146* dialing prefix if necessary:
      • To check your balance dial¬† *146*099# and press the TALK (or SEND) button
      • To add funds dial *146*098XXXX*ZZ# and press the TALK (or SEND) button,
        where XXXX - 4 last digit of your credit card on file, ZZ - Recharge amount
      • You need to press * on your phone in the above dialing sequences (it is¬†a¬†star¬†character located on the keypad)
      • Activation of voice mail *146*091# and press the TALK (or SEND) button
      • Deactivation of voice mail *146*090# and press the TALK (or SEND) button
      • Check number of messages in Voice Mail *146*094# and press the TALK (or SEND) button
      • To listen to voice mail *146*095# and press the TALK (or SEND) button

      The prefix *146* and # at the end can be used from any phone. However, newer OneSimCard SIM do not require it and you should be able to dial codes directly, 091, 094, 095, 099 or 098XXXX*XX Talk.

      If you have an older SIM and the dialing does not work without entering *146*, please follow these simple instructions to remove the need to dial *146*:

      How to activate compatibility mode:

      1. Locate OneSimCard Menu.

       On iPhones it is called SIM Applications menu and is located under Settings- Phone menu

               On Androids it is called SIM Toolkit app and it looks like one of the apps

      1. Open "OneSimCard" menu ( SIM Applications, SIM Toolkit, STK)
      2. Select "Settings
      Newer SIM Cards: Select Compatibility option and make sure "On" is selected
      Older SIM Cards: After selecting Settings:
      1. Agree with message by pressing "Yes"
      2. Dial digits "1101" and select "OK" (Screen will show "CC OptionX: ON" message)

      Bear in mind that if you have powered your telephone down, and have removed and reinstalled the battery, you will need to follow the programming steps outlined above, again.

      When dialed directly, some Nokia and other phones can display message: "Call is not allowed" or "Call is barred". Just ignore this message and wait for the ring-back for 10 seconds or so.

25. Ordering Questions
26. eSIM
    • How do I top up my data with eSIM?

      There are two ways you can do this:


      1. From your mobile go to ma.onesimcard.com. This provides the access to your free OneSimCard mini account. Free means that there is no need to have the SIM balance or data package on the SIM to be able to access this page in over 110 countries. Log in to your account and activate a new data package.

      2. From any computer log in to your on-line account at OneSimCard.com to order a data package.
27. OneSimCard General Service Questions
    • Will¬†a OneSimCard international SIM card work with my mobile phone?

      OneSimCard will work with almost any unlocked GSM tri-band or quad-band cell phone. A partial list of compatible cell phones that we have tested can be viewed here.

      If you need to unlock the phone, we suggest contacting your carrier or phone manufacturer for unlocking information or services.

      If your phone is not a quad-band phone, please make sure that the bands of your phone are those required in the country of your travel. You can look it up here.

      If you are still unsure whether your cell phone is compatible, contact support or purchase an international cell phone and SIM card bundle from us, which all come preloaded with our international SIM card, $10 balance and All in One International Travel Adapter Plug.

28. eSIM
    • How does eSIM works?

      eSIM is not a physical SIM. It is a piece of software downloaded to a compatible phone. So there is no shipping involved with delivering eSIM.


      eSIM makes your iPhone or Pixel phone to be a dual SIM phone. This means that you can use two sim cards on the phone at the same time. You can select which SIM card is used for calls and texts, and which one is used for data. You can select which sim card is to be the primary and which one not to be used. You can make these changes from the settings of your phone at any time. In short - eSIM offers greater flexibility to your eSIM compatible phone. It allows you to use the service provider of your choice - whether you are traveling or staying home.


      OneSimCard eSIM can be installed only on a single device. It can't be moved to another device, but it can be re-installed on the original device up to 10 times if required.
29. Ordering Questions
    • Can I upgrade my Standard SIM to a Universal SIM or my regular size SIM to a micro or nano SIM?

      Yes. If you would like to upgrade your Standard version SIM card to a Universal SIM card, or upgrade a regular size SIM card to a micro-SIM card (for example, to use in an iPhones) then place your order online by selecting the product option on our Mobile Accessories page here. In the shopping cart you will be able to select your upgrade and number transfer options.

30. Ordering Questions
    • Do international cell phones purchased from OneSimCard come with a warranty?

      Unless otherwise noted, all phones sold on OneSimCard.com come with our standard 90-day replacement warranty. This warranty covers any mechanical defects, but does not include damage due to acts of god, neglect, water damage, or other intentional or unintentional abuses of the phone. OneSimCard does offer currently extended warranties available for purchase.

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