When a contact has multiple phone numbers stored on your phone, you’ll see the particular phone number used within the message.
There’s also a bold letter before the phone number to indicate the number type (for example,
M stands for
Mobile).
Keep in mind that your response will be sent to the phone number of the latest message you’ve received from this contact.
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On the All messages screen, tap a contact (or phone number) to display the exchange of messages with that contact.
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Tap the box that says Add text, then enter your reply message
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Press
and then tap .
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Select another phone number of this contact, and then tap OK.