The International Organization for Migration (IOM) has set up information and support hotlines for persons fleeing Ukraine in different countries. Below are currently operational hotlines, and regular updates are here.
 
IOM Information Websites and Hotlines:

• Ukraine: 527 (free from mobile phones), 0800 505 501 (free from landline phones), see IOM Ukraine. This IOM-supported National Toll-Free Counter-Trafficking and Migrant Advice Hotline works from 8 am to 8 pm
• Poland: +48 22490 2044; see IOM Poland
• Romania: +40219590 (in Ukrainian). The online support platform dopomoha.ro (developed by Code4Romania with support from partners including IOM Romania) is now live. 
• Lithuania: +370 525 14352. This is run by IOM's Migration Information Centre, also available through live chat on this website: www.renkuosilietuva.lt/en/
• Slovakia: +421 5263 0023 (from abroad), 0850 211 478 locally, Telegram/Signal: +421 908 767 853 (voice only), see IOM Slovakia
• Moldova: 0 8000 15 27 within Moldova, 00373 22 820 007 from Ukraine
• Belarus: Hotline on safe travel abroad; 00375 162 21 8888 within Belarus, 8 801 201 5555 from abroad

If you have fled Ukraine, are now in Vienna/Austria, and need support, here is some information that might be helpful:

Ukraine support hotlines in Vienna:

• Caritas Hotline: 05/17 76 380, Monday to Friday 9 am - 4 pm. Multilingual hotline of the NGO Caritas for questions on entry, stay and accommodation.
• BBU hotline in German, Ukrainian and Russian for questions on emergency reception centers: +43 1 2676 870 9460
• BBU legal counselling service in German, Ukranian and Russian: +43 1 2676870 9461
• BBU information for NGOs and authorities looking for the nearest accommodation: +43 1 2676870 9462

The following websites also contain relevant information:

• UNHCR Austria 
• Austrian Ministry of the Interior: FAQs in German and Ukrainian 
• Federal Criminal Police Office: Human Trafficking Hotline (24/7): +43-677-61343434
• Information leaflet by NGO LEFÖ about dangers of exploitation and trafficking for displaced persons (English, Ukrainian)
• Public Transportation: Ukrainian refugees may use public transportation in Austria free of charge. You will need to show your Ukrainian passport or ID.

Some more information for Vienna:

• City of Vienna's Humanitarian Arrival Center "Sport- und Fun-Halle Leopoldstadt"
  Address: Engerthstraße 267 - 269, 1020 Vienna
  Opening hours: Around the clock, seven days a week  

• City of Vienna's Registration and Counseling Center 
  Address: Austria Center Vienna, Bruno-Kreisky-Platz 1, 1220 Vienna
  Opening hours: Monday to Friday, 8 a.m. to 6 p.m.
  Please register for appointments via Fonds Soziales Wien

• Caritas Emergency Accommodation Centre at Vienna's main train station
  Address: Am Hauptbahnhof 1, 1110 Vienna

More information on the IOM Ukraine Response is available here.