The customer helpline is open from 8 p.m. To 6 p.m. from Monday to Friday.
Outside the customer helpline opening hours, please use the My OpenCall self-service function or leave a message and we’ll contact you during office hours the next day.
+420 778 820 820,
*88 for OpenCall customers
Address for written correspondence:
O2 Czech Republic, a.s. – OpenCall
Za Brumlovkou 2/266
Praha 4, 140 22