You can use any previous generation of Gvey sim before Ultra but function the same as Ultra.

just add this little tweak ultrasnowCN following direction:

1. Jailbreak your iphone4
2 .add source : in the Cydia
3. install ultrasnowCN,and input the registration code (keep connection)
4. reboot iphone4, it can get the signal automaticallyGuarantee will work on any gevey sim before Ultra but function as it is Gevey Ultra

(Note: this trial for 3 days, if you want to keep use it any longer after 3 days, you have to purchase activation code, Wait for Crack)