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How to set up iPhone4s SMS group sending, and how many people can I send at most?

Phenomenon: It comes with its own system and can only add 10 people. Mobile for personal use, Unicom's 4S is no problem. Call the telecom, and the operator says there is no limit to SMS and the like. As we all know, under normal circumstances, when sending SMS in groups with 4S, it will automatically become MMS, which will lead to the failure of sending SMS in groups. Solution: after "send and receive MMS" is turned off in Settings-> Settings >, the group sending SMS is normal (and the number of recipients can exceed 10), which has been tested. When the MMS is ready, press the MMS to open it. . .