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This is hard to answer, as how do you properly separate instances of being inspired from having the constant companionship of the Holy Ghost?
It's hard to tell what answer exactly would do this question justice. Here, we have a collection of blog posts where the apostles each tell something about how they #HearHim, meaning Hear the voice of Jesus Christ, meaning the Holy Ghost.
There are many, many talks from general conferences which contain personal experiences with the Holy Ghost, but most often not in the context of "constant companionship with the Holy Ghost", simply in the context of whatever the talk is about.
Lastly, "Having the constant companionship of the Holy Ghost" is not simply a state, it's a constant struggle to stay in contact, if you will, and to recognize and understand the Holy Ghost. The gift of the Holy Ghost is basically just the promise that the other side of the connection is always open.
However, there is no guarantee that the person will receive inspiration and guidance from the Holy Ghost just because the elders have laid their hands on his or her head. Each person must βreceive the Holy Ghost.β This means that the Holy Ghost will come to us only when we are faithful and desire help from this heavenly messenger.