Sending attachments to non-Apple people-- the green ones-- can fail with an "Attachment is Too Long" error. Here's how you fix that.
Is iMessage on iPhone stuck, "Waiting for activation"? Apple's suggestions don't always work. Here's how to activate iMessage the right way.
Delete or forward part of text message conversations on your iPhone, maybe NSFW photos. You can delete an entire conversation; this is better.
You want your iPhone's text messages to sync with your Mac and iPad-- all messages, green and blue both. Here's how you set it up.