Whether you're trying to send a personal SMS message to a friend or a business associate, or using a service like DialMyCalls to send SMS messages to high volumes of people, you've probably run into issues with your text messages not being delivered.
While DialMyCalls takes steps to avoid this, there are still a few rare situations that can cause SMS message delivery to fail.
In this article, we'll take a look at some of the most common causes that text messages may not be delivered, so that you may better understand how to best use DialMyCalls, and ensure that your messages are always delivered to the appropriate people.
1. Invalid Numbers
This is the most common reason that text message delivery can fail. If a text message is sent to an invalid number, it won't be delivered - similar to entering an incorrect email address, you will get a response from your phone carrier informing you that the entered number was invalid.
There can be quite a few reasons for this. For example, all messages being sent to U.S. telephones must begin with the country prefix "1" - if the international country prefix is not added, the message may fail to deliver correctly.
Other causes of invalid numbers include attempting delivery to landlines - landlines cannot receive SMS messages, so delivery will fail.
And, of course, SMS messages may fail if an individual's phone number is incorrect, disconnected, or otherwise invalid.
2. Carrier Filters
Similar to email, some cell phone carriers have implemented filter systems that can block spam, phishing attempts, and other unwanted messages. One of the primary ways that carriers block spam is by separating "A2P" and "P2P" messages.
P2P messages are messages sent between individuals - and they always have a valid alphanumeric senderID. These messages are likely to be delivered without being filtered.
A2P messages are messages sent from mass texting applications. Some carriers will "filter" these messages, and prevent them from being sent to individuals, in an attempt to prevent spam.
To avoid this, DialMyCalls uses advanced A2P routing to send messages through A2P-enabled routes. However, some messages may still be blocked if they contain certain keywords, though this depends on the specifics of each individual's carrier.[click to continue...]
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