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 OneSimCard Apps Installed.

If your phone or SIM card is lost or stolen and automatic recharge is on, this could be a serious problem.

To prevent this, log in to your account and activate the option to block your service immediately after you notice your phone or SIM card is missing. You can find this option in the My SIM Cards menu. Your OneSimCard service for this SIM card number will be instantly blocked. The remaining balance on your lost SIM can be transferred to another SIM card on your account or you can order a replacement SIM card if you would like to keep your phone numbers from the lost SIM. However, the existing data package can’t be transferred to the new SIM card.

Alternatively, you can contact customer service online or call 001-617-313-8888 for assistance.

Some recent Android upgrades to versions 4.2.1 and 4.2.2 have a bug causing the OneSimCard Menu, labeled as SIM Toolkit, to be disabled.

If you do not see the SIM Toolkit app in your Android phone, please try doing the following:

Go to Settings>Security>Other Security Settings>Setup SIM Card Lock>Lock SIM Card. It will ask for the default SIM PIN. Enter 0000. Power off the phone and turn it back on. The SIM Toolkit app will then become available, though it might take 1-2 minutes for the phone to display it.

On Android version 5.1 go to Settings > SIM Cards > SIM Toolkit

Once you have access to the SIM Toolkit, select it, scroll down to Settings, enter 1101 and press confirm. Your phone will now be able to dial normally.

 

1. Go to Recharge Menu and recharge your SIM
   or
2. Set up auto-recharge in Recharge Settings Menu

• From the OneSimCard menu of your phone, scroll down to Add Credit and select this option.
  You will see 'Please enter PIN' on the screen.
  Enter 4 digit 1SIM Fund PIN + * + Amount + press the OK.
  For example, if you need to add $50 and the PIN is 8654:
  You would dial 8654*50 and press OK. In few seconds you will get a confirmation message with your new balance.
• Alternatively you can do the same from the main dial menu of the phone by dialing: 098+PIN+*+Amount+ Talk (Send) button.
  For example, if you need to add $50 and the PIN is 8654:
  You would dial 0988654*50 and press TALK. In few seconds you will get a confirmation message with your new balance.

Yes. Your Universal, Expedition and eSIM World OneSimCard mobile number can currently be forwarded to EU, Canada, USA, Russia, Ukraine and Belarus numbers. It's 100% free to forward your OneSimCard phone number to many countries including to U.S. or Canadian numbers. Forwarding to some countries, as well as to satellite phones, will carry a forwarding charge as listed in the Rates & Coverage page on OneSimCard.com.

To enable/disable call forwarding from your online account:

Log in at OneSimCard.com and go to the My SIM Cards menu. Select your SIM card number and enable/disable Call Forwarding on this screen.

To enable/disable call forwarding from your phone:

Dial *146*081*XXXXXXXXXXXXX# and press Send/Talk (where XXXXXXXXXXXXX is the forward-to number in international format: 00+countrycode+number)

Newer SIM cards use *81* instead of *081*

Example: to forward to U.S. number 1-617-555-1212, dial *146*081*0016175551212# and press Send/Talk.

If you get an "Unknown Format?" message, dial *146*81*0016175551212#

To disable call forwarding, dial *146*080# and press Send/Talk. If you get an "Unknown Format?" message dial *146*80# and press Send/Talk.

We allow moving balances from one SIM card to another in the following cases:

• Corporate Accounts - anytime.
• Individual Accounts - only when a SIM card is lost or stolen. The remaining balance from your lost or stolen SIM card and PEN(s) if any can be transferred to another SIM card on your account.

Yes. If you are not available to answer the OneSim VoIP call or if the OneSim VoIP app is turned off, the call will be routed through our standard roaming network. If the call is not answered it will be sent to your OneSimCard voicemail box. 

NOTE: Voicemail is not available for DataMax or DataMax eSIM cards with OneSim VoIP.