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Android phones are typically used for low volume projects since cell phone companies usually limit the number of messages that can be sent or received through a regular phone number.
Sending an SMS directly from a phone
A CommCare phone application can also generate an SMS from a form using the phone's default SMS application and allow the user to send this message directly to the recipient, without requiring a server. This approach gives full control to the mobile user and does not require data connectivity between the user and the server. It can therefore be useful in settings where the cell network only supports SMS messages. SMS costs are charged to the user's SIM card and CommCare cannot send these messages automatically, always requiring direct user interaction. Here is a brief description of how to set up a CommCare form to generate an SMS.
Short Code vs. Long Codes