一旦は成功・・だがね（涙

確かに銀SIMで電波を掴んだ！　SMS、通話テストもOK！
ですがその状態が持続しないのです。しばらく経つと電波をロストしてしまいます。これはSBM特有なのか？それともYellowsn0wのバグなのか？
一度、iPhoneを初期化して再構築してみようかなぁ・・・本日はこれまで！
　　　Eternal from iPhone

＜追記＞
これでどうかな？

Try taking out your SIM card, locking the phone for 5 minutes, and then insert sim card and wait 5 minutes when it's at the slide-to-unlock screen. Slide the unlock screen after 5 minutes and see if this works.

＜追記２＞
う〜ん、不発・・しばし模様眺めということで。

＜追記３＞
のちほど挑戦します

1. Install yellowsn0w thru cydia, keep your Third-Party Sim in the iphone
2. Reset Network Setting "Most important" 99% success rate will depend on this
3. Reboot your inphone
4. Wait a little over a min.
5. Remove your sim card and re-insert it back in
6. Wait 30 sec.
7. Turn on Airplane mode and wait 10 sec. "This is important as well"
8. Turn of Airplane mode, you should see "searching" start smiling T-Mobile carrier will start appearing.
9. Start make call!