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Most compatible Bluetooth modem to use with Arduino Uno R3?

I'm looking for a Bluetooth modem that can be connected with the Arduino Uno R3, and communicate with Android mobile device. I found one modem (the BlueSMiRF RP-SMA) but it was to expensive, and it ...
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What is the best bluetooth shield for the arduino mega?

I am currently building an electronic keypad door lock that I want my smart phone to be able to pair up with and open it for me. I will be using an Arduino Mega 2560 and I was wondering what the best ...