About SMS -
 
  WHAT IS THE SHORT MESSAGE SERVICE?
 
  The Short Message Service (SMS) is the ability to send text messages of up to 160 characters to a mobile cell phone, and for the phone user to be able to read the text messages.

SMS was conceived as part of the Global System for Mobile communications (GSM) digital standard, originally only at 900MHz but later also at 1800MHz (also known as DCS1800), and 800MHz (E-GSM).    In the USA, most GSM is on 1900MHz (also known as PCS1900).    You can therefore in principle use these facilities on any GSM or "Personal Communications Networks" (PCN, which is also GSM).

Recently, this capability has become more widespread. In the USA You can now send "text messages" to many digital phones. This amounts to the same thing as SMS with GSM phones.
 
  GSM and PCN systems are able to store SMS messages for deferred delivery. This means that if your handphone is out of range or turned off, your messages will be stored by your mobile phone operator and delivered to your handphone when it is in range or switched on again.
 
  Having established that you have a suitable digital phone, you need to check the exact facilities offered by the phone and the network. SMS Mobile Terminated (MT) is pretty much ubiquitous unless you have a very old phone. This is the ability to receive text messages at the phone. SMS Mobile Originated (MO) is only on a few phones. This is the ability to send text messages from the phone. There are other ways to send SMS messages: the most networks have public dialup access. On this page you'll find several ways to send SMS from the WWW or from E-Mail worldwide.
 
 
General SMS directory

Send SMS email to any GSM phone
Send SMS email to USA Verizon phone
Send SMS email to UK BTCellnet phone
Send SMS email to German GSM phone

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My best email address: charlie@elektro.cmhnet.org