The largest text message possible is quite literally unlimited, as long as the sending and receiving devices have enough memory to store it.
In most cases, the size of a text message is limited by the device or network it is sent over, rather than a message size limit imposed by the messaging app itself. For example, if a phone has a limited amount of internal memory, it may be unable to store a message that is too large. Additionally, some networks may impose size limits on messages they transmit.
One of the most popular messaging apps, WhatsApp, imposes a maximum message size of 16 MB. This limit applies to individual messages and also to messages sent in a group chat. On the other hand, the popular social media platform Twitter imposes a character count limit of 280 characters per tweet, which is much smaller than the size of a text message.
The largest text message ever sent was a whopping 8,889 words long, sent by a London-based software developer in 2005. He was attempting to break the record for the longest text message ever sent, and did so by typing every word of the play “Hamlet.” The Guinness Book of World Records recognized the feat, and even featured the developer in their book.
Some messaging services also allow much larger messages to be sent. For example, if you use an email service to send a message, the size limit is usually much higher than that imposed by a messaging app.
In conclusion, the largest text message possible is unlimited, but usually limited by the device or network that it is sent over. Additionally, messaging apps usually impose a much lower limit on message size than email services. Finally, the Guinness Book of World Records has recognized the largest text message ever sent, which was 8,889 words long.