textSMS

textSMS, commonly referred to as text messaging, is a mobile communications service that enables users to send short alphanumeric messages between mobile devices using the Short Message Service (SMS). Messages are typically limited to 160 characters when encoded with the 7-bit GSM default alphabet; longer messages can be transmitted by concatenating multiple SMS segments, a feature supported by most networks and devices. The service operates over cellular networks and relies on an operator's Short Message Service Center (SMSC) to store and forward messages to the recipient.

In operation, a sender's device forwards the message to the SMSC, which routes it to the recipient's device via the mobile network. SMS is supported across generations of networks, including GSM, CDMA, 3G, 4G, and 5G. Enterprise usage often relies on application programming interfaces such as SMPP or HTTP gateways to originate or receive textSMS at scale, including alerts, verifications, and customer communications.

Key features include delivery receipts (where supported), support for concatenated messages, and short codes or long numbers for sender identification. Limitations include the fixed character limit, potential latency, and charges per message. Security is another consideration: SMS is not end-to-end encrypted by default, and messages may be stored or logged by intermediaries.

textSMS remains widely used for simple person-to-person messaging, notification systems, and as a fallback or backup communication channel. In recent years, some services have shifted more sensitive communications toward encrypted messaging apps, while SMS continues to be supported for broad compatibility.