How to send text messages and make calls on Ubuntu mobile phone

They use a software to hide their mobile phone numbers. You can download it yourself, but I don’t know what it’s called. It’s also an Internet phone call. Sometimes they set up a street vendor on the roadside to recharge 100 yuan. You can also hide your own number by sending 100, but it is very inconvenient to make calls. You have to call this software first, then enter the number you want to dial, and it will call it for you. If you are hiding others on your mobile phone The number is very simple, just download 360 Mobile Guard. There is a private space inside it.