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11. OneSim VoIP

    • I can make calls through OneSim VoIP. However incoming calls are going through my roaming SIM. What's wrong?

      If your incoming calls are not being routed through the OneSim VoIP app then you are either not connected to Wi-Fi or the OneSim VoIP app is not active.

      Please make sure to check your phone's sleep settings, as they are usually preset to have Wi-Fi turn off when the phone enters sleep mode. To prevent this and to keep OneSim VoIP active for incoming calls, find the settings in your phone and set it so Wi-Fi does not turn off when the phone enters sleep mode.

      Note: if the OneSim VoIP logo on the top of your phone display is gray then you will not be able to receive calls through the application. When the logo is yellow that means you are connected and can receive calls through OneSim VoIP.
12. OneSim VoIP

    • Can I use OneSim VoIP over the Internet Data offered by OneSimCard SIM? Will it save me anything?

      In countries where the cost of using mobile Internet Data is below 20 c/MB, the cost of using SIM VoIP over the data is comparable or less than the actual calling rate from the country.

      As a rule of thumb, the SIM VoIP will use 1MB /Min of talk time. So, if the cost of Data in the country is 10 c/MB, then 1 minute SIM VoIP call will cost you 12 cents /minute. You need to have a 3G connection in order for SIM VoIP to work this way. 
13. eSIM

    • Is there an eSIM App for Apple iOS and Android devices?

      Yes. The 1Sim eSIM app is available at:

      Get it on Google Play



      These apps allow for much easier management of eSIM data plans.

      To connect your eSIM app to your existing web account at www.onesimcard.com, please complete the following simple steps:

      1. Install eSIM app

      2. Log in to the eSIM app using email and password for your current online OneSimCard account

      That is all. You will be able to see the device connected to your web account in the MY SIM Cards menu of your account at www.OneSimCard.com

      Customers who ordered an eSIM directly from the eSIM app do not need to connect the app and their online account at OneSimCard.com as they are already connected.


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