If mobile access is important for your travels, choose one of the more popular places for your vacation. Listvyanka, Bolshie Koty, Bolshoe Goloustnoe, Olkhon Island, Small Sea Strait and Arshan have the best connection quality. Yarka Island, Nizhneangarsk, Severobaykalsk and the east coast from Ust’-Barguzin to Kurbulik also have a signal. However, remote areas and wildlife sanctuaries only have satellite communication.
Baikal has the same service providers as Irkutsk:
They list Baikal as Far Eastern tariff zone. If you don’t want to turn on your roaming, buy a SIM card in Irkutsk. If you’re preparing for a long trip, put extra money on you cell. Only Listvyanka, Arshan, Small Sea Strait, Baikalsk, Slyudyanka and Severobaikalsk have ATMs and express payment machines.