Q: SMS Message Troubles after Updating
I recently updated to IOS 9.3 and to OS X 10.11.4. Since these updates, I have been having difficulties sending SMS messages. iMessages transmit briskly. But, I often get failure-to-send errors three and four times in a row when trying to send an SMS message longer than a single short sentence.
I have friends with non-Apple devices that I text frequently. Prior to the latest updates, my SMS messages to them would transmit quickly. Not now. I am not sure how to make Apple aware of this situation. I did send a direct message to @AppleSupport on Twitter. Not sure how effective that will be.
Anyone else having this problem?
Note to Moderators: Not sure where to list this question. Please move to appropriate board. Thank you.
iMac, OS X El Capitan (10.11.4), 2013 2.7 GHz Intel Core i5 iMac
Posted on Mar 25, 2016 12:14 PM
Curious...
Short Message Service (SMS) has a 160 character limit (includes spaces, BTW) - this limit is extended by Multimedia Message Service (MMS) that is pretty much like an email
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MMS messages are delivered in a different way from SMS. The first step is for the sending device to encode the multimedia content in a fashion similar to sending a MIME message (MIME content formats are defined in the MMS Message Encapsulation specification). The message is then forwarded to the carrier's MMS store and forward server, known as the MMSC (Multimedia Messaging Service Centre). If the receiver is on a carrier different from the sender, then the MMSC acts as a relay, and forwards the message to the MMSC of the recipient's carrier using the internet.[4]
Once the recipient's MMSC has received a message, it first determines whether the receiver's handset is "MMS capable", that it supports the standards for receiving MMS. If so, the content is extracted and sent to a temporary storage server with an HTTP front-end. An SMS "control message" containing the URL of the content is then sent to the recipient's handset to trigger the receiver's WAP browser to open and receive the content from the embedded URL. Several other messages are exchanged to indicate the status of the delivery attempt.[5] Before delivering content, some MMSCs also include a conversion service that will attempt to modify the multimedia content into a format suitable for the receiver. This is known as "content adaptation".
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So, what this means is that your iDevice is "deciding" that the problematic messages need to be MMS messages (because of the character count) and going about "encoding" it, then sending it off to your carrier's store & forward server.
I am wondering if there may be some wisdom in contacting your carrier about this.
Posted on Mar 25, 2016 1:38 PM