Quote: Bluetooth: Garmin made the virtually unforgivable selection of going with Bluetooth 2.1.  In doing so, the unit will 
never
 be compatible with the host of new Bluetooth Smart sensors flooding 
onto the market – all of which require Bluetooth 4.0 (it’s a chipset 
thing, not a software thing).  This means that there can’t be 
connectivity to any new Bluetooth Smart heart rate straps, speed/cadence
 sensors, power meters, or other items.  Further, they couldn’t expand 
into areas such as connectivity to Bluetooth Smart trainers – like the 
Wahoo KICKR.  How cool would it have been if you could control 
resistance on your trainer from the Edge?  Simply can’t happen now.  
They could and should have placed a full Bluetooth 4.0 chip in there 
(not just Bluetooth Smart like in the 
Garmin Fenix watch), which would have still been compatible with legacy smart phones as well as new Bluetooth Smart sensors.
Some will speculate that perhaps Garmin went with a non-Bluetooth Smart 
compatible chip in order to slow adoption of Bluetooth Smart devices, in
 favor of ANT+ (which they own).  The problem is, I think it’ll actually
 only serve to reduce their market share (Garmin’s) in this market.  
Garmin is facing a huge battle against cell phones as head units 
(including cycling), and by limiting itself, it only serves to isolate 
it further from the reality that consumers want 
both.  It had a
 golden opportunity to bridge the gap and be the only device on the 
market that could do both…instead fell off the bridge. ENDQUOTE
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Maybe that's why I have had such trouble with the Garmin to Bluetooth connection on my almost 2 year-old high-end SmartPhone. I guess they assume cyclists want to spend money on upgrades to all of their devices. 
It is a slippery slope to even engage the issue...
Thank you.