If an old device works, it is not necessarily safe
Sometimes it can seem that any (even old) device that is functional is suitable for the job. However, this assumption is often wrong.
If you are the owner of a mobile number under the university mobile tariff (see the Mobile telephony page), you can use the new conditions when calling into Ukraine. All customers on the Vodafone network has 100 free minutes for calls and SMS for CZK 1 (be aware there is no VAT included in this amount) from 5 March. Once the free minutes are used up, the charge will be CZK 0.83 (excluding VAT) per minute.
Roaming from Ukraine remains free - within Ukraine, calls and SMS to Czech and Ukrainian numbers (including incoming calls) are free until further notice.