iPhone cracked front and back
Phone cracked front and back side aswell
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While the front glass on iPhone can be replaced, the back glass on iPhone is fused to the phone and cannot be replaced.
Apple will not replace the front glass when the back glass is cracked. If you didn't purchase AppleCare+ at the time you bought the phone, you will need to pay for an Out of Warranty replacement.
Since you didn't mention the actual phone you own, see this link for pricing --> iPhone Repair - Official Apple Support