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I tried to create a 128Bit with the iOS CoreBluetooth framework. The code that I have written is here: //16Bit Value-String static NSString * const ADVERTISING_SERVICE_16=@"FFC0"; //Var for 128Bit String static NSString * ADVERTISING_SERVICE; //A Base UUID static NSString * const BASE_UUID=@"0405060708090A0B0C0D0E0F"; + (NSString*) get128BitUUID:(NSString*)uuid{ return [[NSString alloc] initWithFormat:@"0000%@%@",uuid,BASE_UUID]; } ADVERTISING_SERVICE = [UUIDFuncs get128BitUUID:ADVERTISING_SERVICE_16]; And now when I try to get a UUID with this: if([service.UUID isEqual:[CBUUID UUIDWithString:ADVERTISING_SERVICE] ]){ [peripheral discoverCharacteristics:nil forService:service]; } I get this error message: 2012-09-04 14:18:06.127 blukiiFirmwareTest[3154:707] *** Terminating app due to uncaught exception 'Invalid UUID string', reason: 'String 0000FFC00405060708090A0B0C0D0E0F does not represent a valid UUID' I don't understand why; the string is a 16 Byte long UUID, this is 128 Bit so why am i getting this error?

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