Big news ,after 1 year hard work by FLAYY SIM TEAM ,4G really come 

FLAYY SIM MINI 7 SIM card this time bypasses restrictions of the activation of the server during the  first time activation process so as to get  a network license, leading to a same use effect without network lock. If the Apple server vulnerabilities are fixed afterwards, there will be no worries and users who get the activated network licenses are expected to use their phones normally as before without being locked, as long as they can keep the network licenses  and do no Pc updation or recovery  (can be an OTA upgrading system), no chaning simcards, and no erasing for phones. This is very similar to the black solution (loopholes are not repaired, then not subject to these restrictions).
FLAYY SIM card uses the default "LTE4G + unlock" mode, instead, telecommunications 4G card can not use "LTE4G + unlock" mode.
If you misuse the telecommunications card activation, you can use the following methods to solve:
1. Dial "* 5005 * 7672 * 0 #" on the dial pad.
2. Click on the mobile operator button. No matter what card it is , click on "GSM. Mobile, Unicom 2G unlock", then choose "accept".
3. Remove the card with the sim card, and then insert together.
4. The phone will turn out to have an activated interface.
5. Go to the "Settings - Phone - sim card application and click on the unlock mode corresponding to your phone card.
(Mobile Unicom click "LTE4G + unlock", telecommunications 4G card click "Telecom 4G card dedicated unlock")
6. Now everthing is ok.