IPhone 4S really messing up what do I do?

Iv had my iPhone 4S for about maybe a year now and it's really been messing up my messages won't send they take 30 mins to send and I don't get any of my messages sent to me this happens on and off and then a couple days ago my screen was glitching in and out my whole screen will shake up and down really fast and today it kept opening up voice control! I don't under stand this iv never dropped my phone never cracked the screens and never have I gotten water on it. What do I do iv reset my phone I reset the network settings iv tried every thing please help

Take it in to apple they will give you a new one your messages may take long to send because your not connected to Wi-Fi or there's not service

Get a Galaxy. Your phone seems to have circuit, antenna, receiver problems.

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