Intent smsIntent = new Intent(Intent.ACTION_SENDTO,Uri.parse("smsto:5551212;5551212")); smsIntent.putExtra("sms_body", "sms message goes here"); startActivity(smsIntent);
Add a semicolon delimited list of phone numbers to "smsto:" as the URI in the Intent constructor. Also refer this [LINK][1]

[1]: https://stackoverflow.com/questions/5448140/sending-sms-to-multiple-people-in-android

Intent smsIntent = new Intent(Intent.ACTION_SENDTO,Uri.parse("smsto:5551212;5551212")); smsIntent.putExtra("sms_body", "sms message goes here"); startActivity(smsIntent); Only for Samsung Devices: add a comma-separated list of phone numbers in URI like `smsto:5551212,5551212`