What is that little circle on the back for?

its the exact opposite of a beer tap ... its a mini pop out breathalizer to help contain drunk texting (admit it you've done it to :p)
 
The circle thing is probably a mic. A verizon rep i spoke to said that when you turn the phone upside down, and place it on a flat area the speaker phone turns on.
 
I can't remember where I read this, so I don't have a link, but it's part of the antenna that is visible externally. This is something new HTC is doing with their phones. On the EVO Shift, you can see the motor responsible for vibration when you take off the battery door. On the Bolt, this small part of the antenna is exposed.

You can see the motor on the TB too! There's a vid by AC that shows it (it's the rebooting one).

like paulmike3 said you can see the vibration motor on the thunderbolt as well.
 
i know Phil answered this and im not 100% sure but it being RF, could that be to receive RF (radio freq), as in for the FM radio?

(i'm not sure if the antenna needs to be exposed to receive FM radio waves).

i do know the tbolt to receive fm radio.


actually, to correct myself above.. i just remembered that the earphones are the antenna for the fm radio. (i think)

so excuse my post and now back to the game thread where i am doing lots of catching up :-)
 
Hah! new TBolt startup sound. "I think you ought to know I'm feeling very depressed. I have a terrible pain in all the diodes down my left side." It may be true!
 
That little rubber plug is for when it drops in the toilet. Take the plug out and it drains all the water.
 
I wonder what the purpose is for that little circle underneath the back speaker & kickstand. It must have some function because there's a cutout for it in the cases I've seen. Ambient light sensor? Tiny tweeter? Holographic emitter? Coffee dispenser? Does anyone know for sure?

thumb_550_htc-thunderbolt.jpg

I believe its for use with an external antenna

Using my commadore 64 on dial up ISDN
 
You guys are all wrong!!!

That's where the Gingerbread man craps after he eats his Ice Cream Sandwich:)
 
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I just popped mine off. It comes out fairly easily. It's a thick rubber plug that covers a tiny external antenna port. The FCC also has specs that corroborate this if you'd rather not pull the plug yourself, but it's very easy to remove to look for yourself.
 
It's just an antenna test port manufacturers use for internal testing, nothing to be used by end users. You see these on a lot of phones, even old feature phones.
 
It's just an antenna test port manufacturers use for internal testing, nothing to be used by end users. You see these on a lot of phones, even old feature phones.

Good point. It looks much too delicate to actually make me want to try and attach something to it. I prefer my external repeater anyway. It's a lot more convenient.
 
It's just an antenna test port manufacturers use for internal testing, nothing to be used by end users. You see these on a lot of phones, even old feature phones.
This came up in March when the TBolt was first released. I answered the same way then. :) Not really for internal testing. It is actually a port where you can hook up an external wired antenna (like for a car -- truckers use 'em all the time). I used an external antenna on all my cell phones for quite a while at my home office, before I found better solutions. The rubber stopper is to protect the connector from dirt. You can pull it out with a safety pin.

Why a wired antenna and not a wireless repeater? Two reasons. First, you must have a much stronger, better signal to repeat it on a wireless amplifier than on a direct connect wired antenna. With a very bad signal you simply cannot use a wireless repeater, but can often use a wired external antenna. Second, a wired connector/antenna combo can be had for maybe $30 total, rather than $200-600 for a wireless repeater. I used to use an external antenna plugged into my phone running to an antenna placed just outside my office window. It works.

HTC ADR6400 Thunderbolt Cell Phone Accessories - Antennas-R.F. Adapters]HTC ADR6400 Thunderbolt Cell Phone Accessories - Antennas-R.F. Adapters]HTC

Wilson Trucker Cell Phone Antenna

-Frank
 
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This came up in March when the TBolt was first released. I answered the same way then. :) Not really for internal testing. It is actually a port where you can hook up an external wired antenna (like for a car -- truckers use 'em all the time). I used an external antenna on all my cell phones for quite a while at my home office, before I found better solutions. The rubber stopper is to protect the connector from dirt. You can pull it out with a safety pin.

Why a wired antenna and not a wireless repeater? Two reasons. First, you must have a much stronger, better signal to repeat it on a wireless amplifier than on a direct connect wired antenna. With a very bad signal you simply cannot use a wireless repeater, but can often use a wired external antenna. Second, a wired connector/antenna combo can be had for maybe $30 total, rather than $200-600 for a wireless repeater. I used to use an external antenna plugged into my phone running to an antenna placed just outside my office window. It works.

HTC ADR6400 Thunderbolt Cell Phone Accessories - Antennas-R.F. Adapters]HTC ADR6400 Thunderbolt Cell Phone Accessories - Antennas-R.F. Adapters]HTC

Wilson Trucker Cell Phone Antenna
-Frank
I would be all over that aentenna of they had a helmet attachment...i woul look so cool :cool:
 

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