Yes it may be possible to et he IMEI number...
uniqueIdentifier
A string unique to each device based on various hardware details. (read-only)
@property(nonatomic, readonly, retain) NSString *uniqueIdentifier
Discussion
A unique device identifier is a hash value composed from various hardware identifiers such as the device’s serial number. It is guaranteed to be unique for every device. You can use it, for example, to store high scores for a game in a central server or to control access to registered products.
Availability
Available in iPhone OS 2.0 and later.
Declared In
UIDevice.h......
But Can Any one tell how to get IMSI NUMber