Regarding CoreESIM, what are the roaming cost implications for Russia (specifically Moscow and St. Petersburg) with a typical EU, UK, or US mobile subscription?

When utilizing a CoreESIM for data in Russia, it is crucial to understand that standard EU, UK, or US mobile plans do not extend 'roam like at home' benefits to this region. Consequently, direct roaming with your home carrier in Moscow or St. Petersburg will incur significant out-of-bundle charges. These often include high per-MB data rates, expensive voice calls, and costly SMS. CoreESIM bypasses these exorbitant fees by providing a dedicated local data allowance, ensuring predictable expenditure. Always verify your home carrier's specific international roaming tariff for Russia before travel to avoid unexpected billing.