How to fix my slow iPhone messaging?

My messages on my iPhone 4s have been extremely slow for a long time. It can take around 5 minutes for a message to send and anywhere form 5 to 20 minutes to get a response, even iMessages. I already tried restoring, didn't work. Can I please get some help? Thanks!

Added (1). I have Verizon so I don't know about a SIM card. I don't have my own

May b its in sim network problem try other sim in your mobile

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