1. 谷歌语音：
Google Voice 是一种电话服务，提供呼叫转移服务和语音邮件服务。它允许用户拥有一个号码并将其转发到多部电话。它由Google于 2009 年推出。它适用于 web、android 和 iOS 系统。尽管更改了电话设备，它仍然可以保留电话号码。它使用用户的 Gmail 中的联系人。它提供许多服务，例如语音邮件、免费短信、通话记录、呼叫筛选、阻止不需要的电话以及语音转录到语音邮件消息的文本。
2. JustCall ：
JustCall 是一种电话应用程序，它使用电话号码在手机或计算机之间提供语音通话。用户还可以使用此服务发送或接收消息。它允许一次连接几个人，即它提供语音电话会议服务。它由 Gaurav Sharma于 2016 年创立，提供呼叫转移等服务。它还通过电子邮件提供语音邮件服务。它主要用于拨打互联网语音电话。通过使用此服务，也可以通过网络浏览器进行语音呼叫。
Google Voice 和 JustCall 的区别：
| GOOGLE VOICE | JUSTCALL |
|---|---|
| It is a telephone service that provides call forwarding and voicemail services. | It is a telephone service that provides voice calls. |
| It is owned by Google LLC. | It is owned by JustCall. |
| It was launched in 2009. | It was launched in 2016. |
| It was developed by Google. | It was developed by Gaurav Sharma. |
| It offers messaging and voice calls but does not offer video calls. | It offers voice calls and messaging. |
| Voice calls can be made only by mobile phones. | Voice calls can be made by mobile phones and computers. |
| It has more number of users. | It has less number of users. |
| Number used in Google Voice is the regular number used to make traditional phone calls. | Phone number is necessary here also. |
| It does not provide conference calls. | It provides conference calls during voice calling. |
| Its services can not be used via web browsers. | Its services can be used via web browsers also. |