Can you still use an Iphone 3G even if it's old?

I just bought an Iphone 3G at a discounted price and it's unlocked. First of all, can I use it to text and talk?

Second, I have a verizon pre-paid account, can I port my number to it and use it as a pre-paid phone?

Third, it has minor repair issues such as having to talk extra loud because the microphone has issues and it shows the battery isn't charging, but I was told it works fine, how much am I looking at cost-wise for repairs?

Yes, you can still use it

You can use the phone yes but you won't be able to use it on Verizon as the use a CDMA network not a GSM. You'll have to get a sim card with AT&t

Sure you can still use it, it might not play the latest games because teh hardware is outdated but it will still work fine for everything.

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