How is it possible to prove that the owner of the phone is the person who actually sent a text message in a legal sense?
You can subpoena the phone company (if need be) to prove that the messages were sent from a certain phone, and/or on a certain account. However, there is no way to completely "prove" who sent the message.
To use this post as an example: How could you "prove" that it is me who is sending you this answer? You can't. You can have a strong suggestion that it is me: I sound like a lawyer and give legal advice; I have access to my account; I use the same writing style as in my other posts; I'm logged on from my work computer, which is protected by a password... but you cannot actually prove that it's me.
You'll note that I keep putting "prove" in quotes. That is because laypeople don't often understand the standards of proof. If it's a civil case, all that you need to do is to convince the judge or jury that it is "more likely than not." 51% proof can win your case.
Do you want accurate, personalized, legal advice that you can rely on? You will have to hire an attorney, not ask on Avvo. I am not your attorney and am not creating an attorney-client relationship by this post. I am therefore giving only general advice. This advice may not apply to you or your situation; may not take account of all possibilities, and may not match the advice I would give to a client. DO NOT rely on this advice or any other advice on Avvo to make your legal decisions. If you want an answer to a legal question you should retain an attorney who is licensed in your state.
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