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Table 4 Practical aspects of sending and receiving SMS text messages

From: Efficacy of a text messaging (SMS) based intervention for adults with hypertension: protocol for the StAR (SMS Text-message Adherence suppoRt trial) randomised controlled trial

SMS text message • Receiving SMS text messages or phone calls is free in South Africa
  • SMS text messages can be sent to participants through any of the local mobile phone network providers
“Please Call Me” (PCM) • PCM messages are equivalent to a missed-call and are freely available (a minimum of five PCMs are available daily) across all local networks
Devices or credit • Participants are not be provided with mobile phones or network airtime credit