All replies to messages sent from Messenger appear in the Inbox in the web site. Replies are attached to the original message in a ‘thread’ so you can keep track of your conversations.

If you have configured a ‘callback url’ messages will also be delivered to your own server.

If you have the Messenger app installed, messages will also be delivered to the app.

If you have ‘forward2mobile’ enabled, messages will be forwarded to your phone.

This is rare but it does occur when the there is a communication glitch between the recipient’s handset and their network, that stops the phone from acknowledging that it has received the SMS.

When this happens the carrier continues to attempt to deliver the same message (as per its store and forward procedures) until it receives an acknowledgment from the phone. This situation results in multiple messages on the handset if the handset does not acknowledge properly (if they all have the same sender number and you are not using short codes then this is probably the situation).

We have found that doing a hard restart of the phone fixes the issue. The recipient should simply pull the battery from the handset, wait a few seconds, reinsert the battery and power the handset up again.

Below are some possible scenarios which can prevent the delivery of messages sending from short codes:

• By default, some mobile service providers in North America block message deliveries initiated from short codes. In such cases, the recipients (i.e. the handset owners) must contact their mobile service provider directly to unlock such blockages.
• Some mobile numbers, which have been ported from one network to another, may also experience non-delivery of short codes messages. In such cases, the previous mobile service provider will reply “STOP ALL” to the sender of all the short codes messages to prevent further deliveries. In such cases, the recipients (i.e. the handset owners) must contact their current and/or their previous mobile service providers directly to unlock such blockages.
• Short codes messages cannot be delivered to recipients using Virtual Numbers, as the sender will be unable to bill the Virtual Numbers holder properly. It is recommended that the recipients to not use Virtual Numbers in such cases.
• Short codes messages will not be delivered if a recipient has previously replied to a sender with any of the following (case insensitive) keywords: stop cancel end quit unsubscribe The delivery of any future short codes message from that sender will be halted. The recipient must contact the sender to resume the deliveries.