基本上有两种方法:

1)使用付费网络服务，例如 www.smspack.in/ [通过GSM调制解调器发送和读取SMS使用AT命令 [ ^ ]

Hi,

There are basically two ways :

1) Use a paid web service like www.smspack.in/[^] to send SMS
or,
2) Follow following article:
Send and Read SMS through a GSM Modem using AT Commands[^]

如果您想通过蓝牙发送消息，In The Hand中有一个用于c#的出色库，称为32feet .net( http://inthehand.com/content/32feet.aspx ).

If you want to send messages via bluetooth, there is an excellant library for c# by In The Hand called 32feet.net (http://inthehand.com/content/32feet.aspx).

请参考以下主题:
将文本消息发送到来自VB.NET应用程序的手机 [通过Web服务使用.NET发送SMS [ ^ ]
使用.NET发送SMS [

Please refer following threads:
Send a Text Message to a Cell Phone from a VB.NET Application[^]
Sending SMS using .NET through a Web service[^]
Sending SMS using .NET[^]