Time and space-dependent applications. It provides a unique harmony with mobile environments. The fact that mobile devices are always with their owners is a unique opportunity for advertisers. This allows customers to be reached at any time. Even though SMS ads are push based applications, they are also used as pull based. For example, an information message can be sent to customers about price comparison between products. Warning messages also contain general information and can be used with chat-based, whatsapp, whatsapp services.