Currently Being ModeratedJan 3, 2013 9:43 AM (in response to Atique39)
There is no lostmyiphone app authorized for the iPhone, except possibly for jailbroken phones. If you mean Find my iPhone and it doesn't show up either:
0. Find my iPhone is not enabled in Settings on the phone.
1. The battery is dead.
2. The phone has been shut off.
3. The phone is in Airplane mode.
4. The SIM card has been removed.
5. It has been wrapped in foil.
6. It has been erased.
7. It has been restored as a New phone.