Having trouble with my iPhone 5?

I got an iPhone 5 a couple of weeks ago so its basically brand new. I used the same sim card and got it cut to fit my phone.
I'm on pay as you go and by topping up I get 500mb of internet/data. Yesterday, i was at work and my internet wasn't working. I assumed it was down to me running out of mb but I just checked and I have 200mb left

Secondly, loads of my texts just came through at once (some were sent an hour ago and some were messages i'd already received yesterday).
Also, when people ring me they cut out often, i'll have to ask them to repeat themselves. This happened with my old phone.

Could this all be down to my sim card? My iPhone is new so i can't see why it would be that.

Could be the sim card
Definitely check it out to a phone repair shop incase

Call in to apple and try to get an appointment. They were great and fixed my IPhone 5 issues too. He even gave up his lunch break to help me.

Check with your carrier, that has nothing to do wtih the phone.

My iphone rings i answer and it vibrates 2 times before i hear them r tgey can hear me i got a new one now it vibrates 3 times

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