My iPhone4 is taking a long time to send messages?

I recently factory unlocked my iPhone and for a few days it has been sending text messages fine. After a few days it starts to take a long time to send a message. I press "Send" and it loads and stays on the loading bar for a long time. After 30+ seconds it either sends or it doesn't send. Also, I have been receiving messages a while after it has been sent. My phone is not jailbroken and my IOS is 6.1.2. Please help!

Added (1). I also have have good internet at places such as my house and it still takes a long time to send.

Its just that Apple Devices suck. And also don't update your iphone anymore. It gets slower when you update it

Don't listen to the other guy it doesn't get slower when updated just make sure you have good internet connection

Do you mean good Wi-Fi? How is the signal from your carrier? Try doing a hard reset (pressing and holding the home button and lock button together until the phone shuts off) and turn it back on and it will probably be faster unless youre in a bad coverage area

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