我可以阻止来电显示工具向别人显示我的电话号码吗？
some businesses may wish to block their phone number from being displayed on the recipient’s caller id screen. this is especially common if companies are concerned that consumers will not answer their telephones if they see that the call is coming from a business.   
不te that it’s impossible to block your caller id when dialing 911, or if you are calling from a vanity (800) number. 
though we don’t recommend this, you may dial 67 before the phone number to have your caller id blocked, or change your settings, if available, to avoid showing caller id. 
if you do this, your caller id will appear as “unknown” or “anonymous”  which may not make the caller any more eager to pick up. 
it’s much better to choose a customized caller id.
it’s certainly possible to customize or change your company’s caller id, and it’s a service that most business phone system providers offer.   
您可以选择拥有业务名称，特定代理的名称，甚至可以在呼叫者id设置中显示的本地电话号码。您还可以购买免费的免费电话号码。 
请注意，您的电话号码更改可能需要30天，以便在国家数据库中注册。