1. To jailbreak, you can use cracking software. You don’t have to spend money to buy paid software on iTunes. You can install more convenient patch plug-ins to make our devices more user-friendly. Disadvantages: Increased system instability.

2. 4.2.1 can be jailbroken using Green Poison, a very simple method tutorial: /content/2011-02-03/20110203184326921, 1.shtml (applicable to all Apple devices except ipad2)

3. Using wi-fi, you can install a wireless router at home and use the broadband network without incurring other fees.

4. Taobao black cards used to be sold very cheaply, USD:RMB = 10:1. Later, due to the crackdown on black cards, black card sellers increased the exchange ratio, which once reached 1:1, so buy now The black card is very inappropriate. Using a black card is not as good as using cracked software after jailbreaking. There are many resources and they are free.

It is said upstairs that black cards will be blocked. It should be said that before using a black card to purchase, first use the black card account to authorize it in itunes, and then purchase software. Even if the account is blocked in the future, you can still use it to purchase. software, but the software cannot be updated and upgraded.