IPhone 4S slow texting

My texts have been taking longer and longer to send/receive on my iphone. However Imessage on my ipad works very fast still. So it's only my phone. How can I make my phone go faster again? (This is only texts. The rest of my phone is fast) does deleting text messages help it go faster?

Deleting text messages doesn't make them send faster. Have you checked your signal strength, if t is low that could be the problem.

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