Does the SIM card offer smooth connectivity at border crossings?

Yes, when crossing the border between two countries covered, all Digital Republic SIM cards allow smooth connectivity. Please note that for this you need to have a roaming data package deposited in advance so that it will be activated directly.

NB-IoT generally does not support the so-called "Seamless cell handover", i.e. the smooth flow of connectivity during the radio cell change. In this case, the connection is terminated and must be re-established.