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0 pointsfy201y ago0 comments

You can verify a phone number is real and active without needing them to reply, or without someone even receiving a notification.

1) SMS supports receipt functionality, which means the sender can be notified when a message is delivered to a handset. This happens at the carrier level, so you can't turn it off.

2) SMS supports 'silent' messages which are a different message class that is not shown to users.

0 comments

kube-system1y ago

True, however, "delivered to a device" and "there's someone reading and replying at the other end" are two different confidence levels of "active".

You could, for instance, be texting an unattended device.

toast01y ago

Receipts are unreliable. Carriers and aggregators regularly filter or fake them.

Receiving a receipt is not a real indication of delivery, and absence of receipt is not a real indication of absence of delivery.

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