Is it cost-effective to travel to Europe and buy an Apple mobile phone?

I am in the United States, and several friends recently came back to China to learn about this situation:

1 IPhone4 in the United States, that is, if you don't sign a two-year agreement with the service provider, the price is almost less than that in China, a little cheaper.

2. If you have a two-year use agreement and pay monthly, the price of an 8g mobile phone should be 199 USD, but the monthly fee is 50 USD+,which is not worthwhile for two years. In one case, you bought it and took it back to China to unlock it. However, because the mobile phone agreement is signed with a passport or SSN (similar to an ID card), it is said that returning to the United States after breaking the contract will leave a stain on your credit history. It is not recommended to do so. The United States is a country that attaches great importance to credit. In case it has an impact on going to the United States in the future, it will not be worth the loss.

3. Now the customs has implemented a new policy since September this year, paying more than 5,000 RMB, and almost all those who have been drawn have to pay taxes, so naturally they have not been drawn.