How much does it cost to get an iPhone 4 Wi-Fi chip replaced?

I just bought an iPhone 4 second hand and just found out that the Wi-Fi chip is old and needing replacing, but the warranty expired in February. Around how much would this cost?

The chip can't be replaced. It would be cheaper to replace the entire phone.

Apple will have about 50$ but you can do it by yourself:

I have a normal mobile chip but my son has given me his iPhone 5. If I cancel my chip and get an iPhone chip with my number how much does it cost and do I keep everything that was on the original chip?

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