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Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your question.It is very likely that if it both echoes, and is stuck on some function including Hold, that you have a phone that is defective/broken.
But you may as well try, once, the removing of the battery in the phone for overnight or a similar period. That might perhaps snap it back into something like usable condition; if it does not, replacing it is the best solution, I think.