All bros here.... I'm facing an issue here, i activate my iphone4s using Celcom data sim card.... however, when i put in my maxis normal phone card, it just doesn't seems to load up... The carrier icons keep popping 'searching...'

Is this the famous 'no sim installed' bug? Am i supposed to update to 5.01 9A406 ?

Sifus... please help me.... Thanks