Question 1

Does Remindavo work with Slovak phone numbers?

Accepted Answer

Yes. Remindavo fully supports Slovak phone numbers starting with +421. It works across all three major Slovak mobile network operators (MNOs): Slovak Telekom T-Mobile (operating as T-Mobile Slovakia — a fully owned subsidiary of Deutsche Telekom AG and Slovakia's incumbent telecommunications operator; Slovak Telekom was formed in 2010 through the merger of Slovenské telekomunikácie (Slovak Telecom) and T-Mobile Slovensko; it provides mobile services on the 091x and 092x prefix ranges in domestic format and is Slovakia's largest mobile operator by subscriber market share), Orange Slovakia (a subsidiary of Orange S.A. — formerly France Télécom — which launched in Slovakia in 1997 under the Globtel brand as the country's second mobile network operator before rebranding to Orange in 2002 following France Télécom's acquisition and group-wide rebranding; Orange Slovakia provides mobile services on the 090x and 091x prefix ranges under number portability and is Slovakia's second-largest MNO by subscriber base), and 4ka (the mobile-only operator that emerged from O2 Slovakia — formerly branded as Telefónica O2 Slovakia since Telefónica SA's 2006 acquisition — after PPF Group purchased the combined O2 Czech Republic and O2 Slovakia businesses from Telefónica in 2014; PPF subsequently separated the Slovak mobile radio access network and launched the 4ka brand in 2020 as a standalone mobile operator focused on 4G/LTE coverage, providing mobile services on the 097x prefix range; CETIN Slovakia, a separate PPF entity, operates the underlying fixed and backbone infrastructure). Notable MVNOs on Slovak networks include Lidl Connect Slovakia (operating on the Slovak Telekom T-Mobile network), Wolke by Orange (Orange Slovakia MVNO for data-centric users), Tesco Mobile SK (on Slovak Telekom), and several smaller MVNOs. Slovak mobile numbers use the domestic format 09XX XXX XXX (10 digits including the trunk prefix 0, which is dropped in international format) — for example, 0915 123 456 becomes +421 915 123 456. When adding your Slovak number to Remindavo, select Slovakia (+421) from the country code dropdown and enter the number without the leading 0 trunk prefix. Remindavo places a test verification call immediately after you save your number to confirm delivery to your Slovak mobile.

Question 2

Is Remindavo compliant with Slovakia's data protection law (GDPR / UOUOSR)?

Accepted Answer

Yes. Slovakia is an EU member state (since 1 May 2004) and applies the EU General Data Protection Regulation (GDPR, Regulation 2016/679) as directly applicable law since 25 May 2018. The Slovak data protection supervisory authority is the Úrad na ochranu osobných údajov Slovenskej republiky (UOUOSR, Office for Personal Data Protection of the Slovak Republic), established under the Slovak Act on Personal Data Protection (Zákon o ochrane osobných údajov, Zákon č. 18/2018 Z.z., as amended) which implements and complements the GDPR in Slovak national law — this law replaced the previous Act No. 122/2013 Z.z. which had implemented the now-repealed EU Data Protection Directive (95/46/EC). UOUOSR enforces GDPR rights for Slovak residents including the right of access (Article 15), right to rectification (Article 16), right to erasure / right to be forgotten (Article 17), right to restriction of processing (Article 18), right to data portability (Article 20), and right to object (Article 21). Remindavo collects only what is necessary to deliver the service — your calendar event times and phone number — and never sells or shares your personal data with third parties. You can request data deletion at any time at web.remindavo.com/delete-account.

Question 3

What time zone does Remindavo use for Slovakia?

Accepted Answer

Remindavo uses Central European Time (CET, UTC+1) in winter and Central European Summer Time (CEST, UTC+2) during daylight saving time, following the EU DST schedule. Clocks in Slovakia advance one hour on the last Sunday of March and revert on the last Sunday of October — the same dates as all other EU member states. Because both Slovakia and the UK shift their clocks simultaneously and by the same amount, the offset between Slovakia and the UK is a constant 1 hour throughout the entire year: in winter, the UK is on GMT (UTC+0) and Slovakia is on CET (UTC+1); in summer, the UK is on BST (UTC+1) and Slovakia is on CEST (UTC+2) — the gap is always 1 hour. Slovakia shares the CET/CEST time zone with Germany, Austria, France, Czech Republic, Hungary, Poland, Switzerland, the Netherlands, Belgium, Italy, Spain, Croatia, and most of Central and Western Europe. Slovakia does not observe any time zones other than CET/CEST — unlike Spain (which uses CET/CEST despite being geographically aligned with GMT), Slovakia's Central European time zone is geographically appropriate given its location in the heart of Central Europe. When you connect your Google Calendar or Outlook to Remindavo, your calendar already stores event times in UTC, which Remindavo converts to your local CET or CEST automatically. No time zone configuration is needed.

Question 4

Does Remindavo work for business users in Bratislava, Košice, and Žilina?

Accepted Answer

Yes. Remindavo works for any Slovak mobile number regardless of location — Bratislava (Slovakia's capital and largest city; the only EU capital city that borders two other countries — Austria to the west and Hungary to the south; home to the Bratislava Stock Exchange, Slovak National Bank, headquarters of major Slovak banks, and the Slovak technology and startup ecosystem; Bratislava hosts the Slovak operations of major multinationals including Volkswagen Slovakia — the Volkswagen Group's largest passenger car manufacturing plant in Central Europe by volume, producing models including the Volkswagen Touareg, Audi Q7, Audi Q8, Porsche Cayenne, and Lamborghini Urus for global export — AT&T Global Network Services Slovakia, IBM Slovakia, Dell Technologies Slovakia, Cisco Systems Slovakia, Accenture Slovakia, and numerous financial services and shared services centres serving Central and Eastern Europe), Košice (Slovakia's second-largest city and the main centre of the Košice Region in eastern Slovakia; home to U.S. Steel Košice — one of the largest integrated steel plants in Central Europe, producing hot-rolled, cold-rolled, and coated flat steel products and employing approximately 12,000 people — Košice also hosts the Technical University of Košice, Pavol Jozef Šafárik University, the Slovak Constitutional Court, and a growing IT and technology sector anchored by the Košice IT Valley association; Košice was European Capital of Culture in 2013), Prešov (the third-largest city and administrative centre of the Prešov Region; located in northeastern Slovakia near the Polish and Ukrainian borders; home to the University of Prešov and Prešov University — formerly the Greek Catholic Theological Faculty of Trnava University; the Prešov Region is known for its natural heritage including the Slovak Karst UNESCO World Heritage Site and the historic wooden churches of the Carpathians), Žilina (a major industrial and educational city in northwestern Slovakia; home to the Kia Slovakia plant in Žilina Industrial Park — Kia Motors' first and for many years sole European production facility, producing Kia Sportage, Kia Cee'd/Proceed, and Kia Stonic models; also home to the University of Žilina, Žilina Regional Airport, and logistics companies serving the Central European automotive supply chain), Nitra (one of Slovakia's oldest cities, a significant agricultural, educational, and industrial centre; home to the Slovak University of Agriculture in Nitra and Constantine the Philosopher University in Nitra; the Nitra automotive cluster includes the Jaguar Land Rover Slovakia plant in the Nitra Industrial Park — JLR's first continental European manufacturing facility, opened in 2018 and producing Range Rover Evoque, Land Rover Discovery Sport, and Defender variants), Trnava (an important industrial and ecclesiastical city in western Slovakia; home to the Stellantis Trnava plant — formerly PSA Group's Trnava plant, now part of Stellantis following the PSA-FCA merger — which manufactures the Peugeot 208 and Citroën C3 for European and global markets; also home to the University of Trnava, established in 1635 as one of Central Europe's oldest universities), Banská Bystrica (the administrative centre of central Slovakia and the Banská Bystrica Region; a cultural and historical centre with significant Second World War heritage — it was the centre of the Slovak National Uprising against the Nazi occupation in 1944; home to Matej Bel University and the Slovak National Museum's Central Slovakia Museum), Trenčín, Martin, Poprad (gateway to the High Tatras), Piešťany, and all other Slovak cities, towns, and regions.

Question 5

Can Remindavo call Slovak mobile numbers starting with +421 9?

Accepted Answer

Yes. Remindavo supports all Slovak mobile number prefixes including +421 90X (Orange Slovakia legacy ranges), +421 91X (Slovak Telekom T-Mobile and Orange Slovakia under number portability), +421 92X (Slovak Telekom T-Mobile), +421 94X and +421 95X (Slovak Telekom T-Mobile and number portability ranges), and +421 97X (4ka). Slovak mobile numbers always begin with 09 in domestic format — there are no Slovak mobile numbers beginning with a different digit. Slovak fixed-line numbers begin with +421 2 (Bratislava) or +421 3X–5X (regional geographic numbers). When entering your Slovak mobile number in Remindavo, select the Slovakia (+421) country code and enter the 9-digit number without the leading 0 — for example, enter 915 123 456 (not 0915 123 456) when your domestic number is 0915 123 456.

Phone Call Reminders in Slovakia

Slovak Mobile Networks Supported

Time Zone — CET and CEST in Slovakia

Slovakia in the EU and Eurozone

GDPR and Data Protection in Slovakia

How to Add a Slovak Number to Remindavo

Frequently Asked Questions

Does Remindavo work with Slovak phone numbers (+421)?

What time zone does Remindavo use for Slovakia?

Is Remindavo GDPR-compliant for Slovak users?

Does Remindavo work in Bratislava, Košice, Žilina, and Nitra?

How do I add my Slovak mobile number to Remindavo?

Remindavo in nearby countries

Start getting call reminders in Slovakia