Problem with my sprint blackberry curve 8530...is it sprint or is it my phone?

So i've had my curve for 6 months, and it's always been a good phone. It never dropped calls, all my texting worked perfectly fine, etc. However, just recently it started acting up: my texts delay for hours for me to recieve. I also recieve the same message from someone about 5-10 times, and like evey 20 minutes. It's gotten so bad that I can't even text on my phone anymore. My calls drop once in a while but it's not too bad.
I called Sprint customer service and told them my problem- they rebooted my phone..the next morning the problems came back.
I went into the Sprint store and they said to take my battery out every other day and I should be fine.
STILL NOT FINE. He said it's not my phone, its the service. But this doesn't happen to my sister or my dad who also has sprint
What should I do I am sick of this and either want a new phone or new service!
 
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