If I sign out of iCloud in my old phone does it erase or affect my iCloud in my new phone?
I wanna know if I sign out of iCloud on my old phone does it affect my iCloud on my new iPhone or like maybe it erases my data on the new phone
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No. Also, you can perform the following procedure on your old phone and it won't affect iCloud or your new iPhone: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support