可信-私密短信与安全电话以及隐私保险箱
CoverMe Secure Messenger Inc.
Second Phone Number
VSim - 验证短信服务
Appnest Technologies
Google Voice
Google LLC
Handcent Next SMS messenger
Handcent
Google 信息
Text Me: Second Phone Number
TextMe, Inc.
短信
Delicious
TextNow: Call + Text Unlimited
TextNow, Inc.
Text Free: Second Phone Number
Pinger, Inc