Meanwhile, almost all or at least all those who use a mobile phone can do something with the shortcut SMS. Especially among teenagers, SMS are very popular because the costs are much lower than in a conversation, but also adult mobile phone users like to fall back on this fast and easy way of transmitting information.
Since every mobile phone has an SMS function and billions of SMS messages are sent and sent every month, few users should be able to write SMS or require SMS instructions.
For many, however, it is interesting to know exactly what an SMS is, which technology is behind it, how the dispatch actually works and what tips there are about SMS:
The abbreviation SMS stands for Short Message Service and refers to a short message consisting of a maximum of 160 characters. To send an SMS, the text of the message is entered first. There are two possibilities, namely either the normal text input system or the dictionary. Each key on the cell phone keypad has several letters and characters.
To type the text using the normal input system, you must press the corresponding key repeatedly until the desired character appears. Although this is a bit tedious, but usually can be quickly learn which keys and how often for which characters must be pressed.
Faster text input using the dictionary. If this function is activated, only the first characters are entered and the dictionary suggests corresponding words. If the word is correct, move the cursor one position to the right, or enter more characters until the correct word appears.
If the respective word does not yet exist in the dictionary, the user enters it completely and the mobile phone automatically saves this word. In view of the limited space there are in addition to advertised words but now also a kind of mobile phone alphabet.
Characters, abbreviations and letter-number combinations
This means that certain characters, abbreviations and letter-number combinations are used as substitutes for written words and as expressions of feelings and gestures.
When the message is ready, the number of the recipient is entered and the message can be sent. The SMS now first reaches the SMS center of the network operator and is then forwarded from here to the recipient. So there is no direct connection between the sender and the recipient’s phone, but an SMS center is always interposed as an intermediary.
This technique has the advantage that the messages are cached for a certain period of time, for example if the receiver does not have network coverage at the moment, their cell phone is switched off or their memory space is completely occupied.
The time can be specified individually for each SMS and is usually referred to as validity. Once the SMS can be delivered, the SMS center then sends the message to the recipient’s cell phone. If there was a direct connection between the two phones, the sender would have to try again and again to reach the recipient. If the recipient can not be reached during the validity of the SMS, the SMS is deleted. This makes sense, for example, in the case of news or traffic information, since such SMS messages are generally only up-to-date and valid for a short time.
Normally SMS will be sent as 7-bit messages in ASCII code.
This code knows 127 different characters and thus in principle all the characters, which are also on a computer keyboard. If, on the other hand, pictures, logos or ringtones are to be sent via SMS, this is done with the 8-bit ASCII code. This recognizes 255 different characters, however the maximum number of characters is reduced from 160 to 140 characters.
Instructions for SMS as a fax
SMS can be sent not only as a normal SMS, but also as a fax. The instructions start right away, because here too the text is written like a normal SMS.
Instead of the number of the recipient but then the fax number is entered. This is also preceded by a specific number combination. This combination of numbers is specified by the respective provider and ensures that the message is recognized as a fax and delivered accordingly.