Dialing code +421
Time zone GMT +01:00
Get a free top up in the equivalent of 5 EUR
Submit USSD or SMS code
on your mobile phone
for each successfully added mobile network operator to our app
USSD and SMS codes are used for
Find own phone number
This USSD or SMS command to find own mobile phone number, whether it is a prepaid or post-paid mobile number.
Check mobile phone balance
USSD or SMS command to check the remaining credit on a mobile phone and the expiry date of a SIM card.
Transfer credit between phones
USSD or SMS command to transfer money from one mobile account to another. Balance transfer often works only within one mobile network operator.
Top up with scratch card
USSD or SMS command used to refill mobile account with a voucher or PIN code.
Mobile operators in Slovakia
With No Zero Balance application for Android you can check pre-paid or post-paid phone balance, check SIM card expiry, transfer balance between mobile accounts, check own number and top up for the following mobile operators in Slovakia
- Orange Slovensko
- T-Mobile SK (Slovak Telekom)
- Telefonica O2 Slovakia