Walmart doesn't do screen replacements . You need to get a place that does that. And it's going to vary from phone to phone .
I would call the I phone store 🙂
You can get the screen replaced and any computer shop that also refurbishes phones, but a refurbished phone won't lower the price. Or you can take it to and Apple store because that is the only way to keep any of the specs perfectly in tact with a guarantee.
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