If they start it as a MMS instead of a SMS, it should come as one long message. MMS needs a data connection to send or receive though.
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Carolzai, receiving those messages in a jumble certainly leaves you trying to figure out a puzzle. As Ann154 mentioned, for that message to come as one, both phones would need Multimedia Messaging service and a data connection. With standard text messages, as there is a character limitation, those messages would be sent piece by piece. Ensure that your phone does have the Mobile Data set to on under the Apps, Settings,Data.
As a side note, does this happen with longer messages from other parties or just this one sender?
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