Seek a reliable cloud calling software. Liars don't come.

Promise no secondary fees, send short messages, which are divided into Android version, computer version and web version. The web version used during the trial will not give you the Android version. I won't tell you until the software is registered. Be sure to keep a mobile phone card that can make normal calls, otherwise the phone number will not be used again.

There is also a web version and a computer, but you don't need your mobile phone card, which is more than twice as expensive. It won't take long to find the website. How do you ensure that it can be used permanently?