client.session.set_dc(4)

async def get_number(num):
    request = functions.payments.GetBankCardDataRequest(
        number=num
    )
    try:
        return await client(request)
    except errors.rpcerrorlist.StatsMigrateError as e:
        sender = await client._borrow_exported_sender(e.dc)
        try:
            return await sender.send(request)
        finally:
            await client._return_exported_sender(sender)