Apple iPhone 4 Phone Series Repairs
Categories, unlike tags, can have a hierarchy. You might have a Jazz category, and under that have children categories for Bebop and Big Band. Totally optional.
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Apple iPhone 4 Phone Repair
Year introduced: 2010 (GSM), 2011 (CDMA)
Capacity: 8, 16, 32 GB
Colors: Black and white
Model number on the back cover: A1349, A1332 -
Apple iPhone 4s Phone Repair
Year introduced: 2011
Capacity: 8, 16, 32, 64 GB
Colors: Black and white
Model number on the back cover: A1431, A1387