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I'm wondering if Bluetooth 4.0 (low-energy) mobile phones could discover classic Bluetooth devices (3.0 and lower), and vice-versa. All I am interested in is discovering the "friendly names".
EDIT: As I have understood the replies of this post, Bluetooth 4.0 can discover classic Bluetooth devices but not the other way around. Then my follow-up question is, can a Bluetooth 4.0 device in LE mode discover classic Bluetooth devices?
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Although Bluetooth Classic and BLE share some common components, they are not compatible. Rather, they work side by side. A BLE radio can't connect to a Bluetooth radio unless that Bluetooth radio supports BLE (called Dual Mode).
Similar to Bluetooth, Bluetooth LE operates in the 2.4 GHz band. The hidden difference is that Bluetooth Low Energy remains in sleep mode unless a connection initiates. The actual connection times only last a few milliseconds, unlike Bluetooth, which connects for a few seconds or a few hours at a time.
Every single Bluetooth device has a unique 48-bit address, commonly abbreviated BD_ADDR. This will usually be presented in the form of a 12-digit hexadecimal value. The most-significant half (24 bits) of the address is an organization unique identifier (OUI), which identifies the manufacturer.
The Bluetooth 4.1 – 5.2 released by SIG includes both Bluetooth Low Energy and classic Bluetooth.
The answer depends on if you mean Bluetooth v4.0 device, or BLE device, the two are not the same.
Bluetooth v4.0 = Classic Bluetooth + Bluetooth High Speed + Bluetooth Low Energy
Therefore, Bluetooth Low Energy is only a subset of Bluetooth v4.0. If your question is regarding Bluetooth v4.0 phones (generally phones are not BLE only), then the answer is Yes, Bluetooth v4.0 mobile phones can theoretically discover Bluetooth v3.0 devices and lower.
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