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The observation about 4.0 may be wrong, but this s evident in both the 4.0 devices I have tested : Samsung Galaxy Nexus and Samsung Nexus S. (Nexus S is actually upgraded by me to 4.0) In the other devices (HTC-Evo and ZTE-Optik), this problem is not there, compelling me to suspect 4.0 ; or Samsung as vendor.

The list of devices it is successfully able to scan have no "pattern" - it is random. It discovers the same device in one scan and may not do so the next time. Maximum 50% of the total devices in the vicinity are discovered.

EDIT : (Added more details)

The devices are close enough and the RSSI values are all > 60 dBm All the "missing" devices are getting discovered through devices < 4.0.

To add some more details, I must say the problem is not with the "other" devices - the same device shows up in one scan and fails to show in other (on Android 4.0) When I say scan - I only mean scanning through startDiscovery() in my code. If I do the scan via Device Settings, then all the devices are enlisted BUT many of them are only cached values - once I try connecting to some device, it says "Device not in range".

Any solutions ?

share|improve this question
That could also mean something's broken with your radio image. I've encountered a similar behaviour with Wifi after upgrading my HTC Buzz from stock 2.1 to CM7: APs are listed on scan, but when I try to connect one they are suddenly all "not in range" (though still displayed in the list). If I leave the device alone for 10..30min, it finally auto-connects to my network. Though in my case it is Wifi (I use no BT), it sounds very similar. – Izzy Aug 14 '12 at 14:59
So why "radio"? Most (not all) people who had the described Wifi problem got if fixed by re-flashing the radio image. – Izzy Aug 14 '12 at 15:00

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