Rogers Iphone 4S Sent away for repair to lock button, approx cost and time?

I have just sent away my Iphone 4S due to a lock button which malfunctions. They charged me an initial fee jut to look at it, and potentially a fee to repair it. I'm wondering if this is an issue they will repair, and if so what the approximate cost will be. I'm also wondering what the typical turn around time is for phones which are sent out for repair is.

The iPhone 5 was officially discontinued by Apple on September 10, 2013 in favor of 2 new iPhone models, the iPhone 5C, a budget model iPhone using most of the internals of the iPhone 5, and the iPhone 5S, the successor to the iPhone 5.[9] Since Apple did not keep the iPhone 5 on as their budget model, it is the second shortest-sold iPhone to date with 355 days on the market, behind the original iPhone which was on the market for 347 days.

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