Send to an Offline Mobile Phone
Unlike a phone call, you can send an SMS message to your friend even when he/she has not switched on the mobile phone or when he/she is in a place where the wireless signal is temporarily unavailable. The SMS system of the mobile network operator will store the SMS message and later send it to your friend when his/her mobile phone is online.
Widely supported
SMS Messages are Supported by 100% of GSM Mobile Phones and they can be exchanged between different Wireless Carriers. SMS messaging is a very mature technology. All GSM mobile phones support it. Not only can you can exchange SMS messages with mobile users of the same wireless carrier, but you can also exchange SMS messages with mobile users of many other wireless carriers worldwide. It’s been now two decades and SMS is still the No.1 mobile killer app! Whichever devices or network upgrages the telecoms move to, SMS messaging is a core technology and is already integrated in these new devices(smart phones, tablets) and networks(3G, 4G). More than that, even app developers are seemlessly integrating their applications with SMS messaging. Like facebook, twitter and Gmail all have features that allow for online conversations to continue offline. SMS messaging provides offline interactivity for these applications and seems to be indespensible because of its advantages listed above. Infact in the next decade or so, we shall see more web and mobile applications that use SMS technology as a core technology for their products or as an add-on feature, but with more interactive and rich user interfaces and features. Image source: Broadbandprime.com