National Bank 5s A1528 System 7 12 Jailbreak Broken Mobile 4G If you upgrade it, can you still go up

Don't upgrade, I haven't been upgraded.

This model is special, the Bank of China A1528 has made it clear that it can support mobile 4G, but it is limited, because of Apple's activation strategy.

So what is an activation strategy? To put it simply, the iPhone needs to be activated for normal use for the first time (or after flashing and upgrading), and the activation needs to insert the SIM card chip of the mobile phone, and the activation process will send the SIM card information you inserted (the country and operator that provides the mobile phone) to Apple's internal server through the network, and the server will decide the corresponding activation strategy of the iPhone mobile phone according to this information (these are not felt in the mobile phone), and different activation strategies will determine different network information in the future.

Previously, Apple's activation strategy and other relevant information can be queried through ordinary channels, but in the follow-up, Apple will block this function and change it to its own control, so if you want to know what kind of activation strategy your mobile phone is, you have to query it through some special channels (such as the almighty **, as long as a few dollars, you can query by providing the IMEI serial number).

At present, the main activation strategies for domestic iPhone 5S (A1528, A1530) are 2181 and 251. In the ID of the mobile phone activation policy through a special channel, if the activation policy is 2181---2181---2181, then I am sorry to tell you that your mobile phone is basically goodbye to mobile 4G, which is basically something that cannot be changed. The activation policy ID of 251-251---251 does not increase the network limit, which will support the mobile 4G network, and 2181---251---2181 can also use mobile 4G at present.

That is to say, the activation policy ID of all three is 2181, and the activation policy with the word N49 is not identified, even if it is completely locked, (the latest news: Apple has now adjusted some activation strategies in the background, and the activation policy ID of A1528: 2181 has increased the support of N49 China Mobile network.)

Some users have responded that A1528 can already use mobile 4G, and it remains to be further confirmed whether it will be fully open for adjustment in the future. That's why some A1528s can use mobile 4G and some can't, which is the root cause of the activation strategy.

This version is a customized version of China Unicom, which supports China Unicom 2G, 3G, and China Mobile 2G. After upgrading to the latest version, you can turn on the 4G option, but you can't enter the mobile 4G network. Locked mobile 3G. Suitable for China Unicom users.

4G card replacement has been officially opened, the Hong Kong version of 5S 5C supports mobile 3G, 4G is a well-known thing, but everyone has always had a question in their hearts, whether the Bank of China 5S 5C also supports mobile 4G? Just after Xiao Jiu replaced the 4G card, he couldn't wait to activate the Bank of China 5S in his hand, and then put the 4G card in it, and was searching - China Mobile, a miracle appeared, and E became a big LTE. Mobile 3G (TD-SCDMA) is restricted and cannot be used due to Apple activation policy issues, but TD-LTE is not.

At present, it has been confirmed that the 5S 5C of the Bank of China can also activate the 4G network. Friends who buy the national version of the iPhone don't have to complain, the 4G you need is here.

Just insert the 4G card.