Overall, everything is fine, but I recommend that the administrators clean up the database. If a client has difficulties registering for the service with a specific number, it's better not to add that number to the list available for the service. It's unlikely that the next client will have a smooth experience, especially if the number is already marked as used. Otherwise, although not on the first try, the number can be found. The price depends on the country and the service. The last time I bought for TG, cheap countries start at 12 rubles, while something more popular, like Kazakhstan, costs 268 rubles. I chose Kazakhstan because I needed a reliable option without the risk of further blocking.