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When phone is broken or have problem. we would send it to repair center. It usually takes 1or 2 days to fix it. So we must use old phone for some days. But most of old phones use normal size SIM card. And new phone use a micro SIM card, it did not fit for old phone. Easy change phone package was designed for this situation. A shape of SIM card slot was stamping on a part of phone package. It did not needs extra material. It contribute to reduce waste. It is easy to produce and easy to use.
Ningbo University of Technology