OK, I tested many devices so far, I pick some Best phones with $50 AT&T Unlimited Plan (with Full HSDPA or HSDPA+ speed data)
These phone is
NO NEED TO BUY Data Packages.
Under $250
1. Samsung Exhibit II 4G (T-Mobile phone) - buy Amazon or Walmart and you need to unlock. Fast processor (1000 MHz). Best price-wise phone.
2. Samsung Galaxy Ace - mini Galaxy S2
Under $300
1. BLU STUDIO 5.3 - really Big Screen, but cpu speed slow... (Automatic APN setting)
2. Dell Venue - High-resolution camera (8 megapixels), buy AT&T version, not T-mobile version. (Automatic APN setting)
Under $350
1.T-Mobile LG myTouch(T-Mobile phone) - need to unlock
Under $400
1. Samsung Galaxy S Blaze(T-Mobile phone) - need to unlock
2. HTC Amaze 4G(T-Mobile phone) - need to unlock
Under $450
1. Samsung Galaxy Nexus GT-I9250 - Best phone so far...(Automatic APN setting)
Under $500
1. Samsung Galaxy S II GT-I9100 - Nice Phone, but I prefer Galaxy Nexus..(Automatic APN setting)
All Phones above, you do not need to buy Data Packages.
and also,
All Phones above give you Full HSDPA or HSDPA+ speed data, but I dont see much different data speed between HSDPA and HSDPA+ (I say, HSDPA+ phone is two time faster than HSDPA phone)....
in my area, I usually get HSDPA+ phone is 1.5Mbps - 3Mbps, HSDPA phone is 0.7Mbps - 2Mbps, and I use average 5GB - 6GB every month since January 2012....
Best pick of mine is Samsung Galaxy Nexus GT-I9250 (I bought it from Google $399 plus shipping and tax, so total $432.18)
I hope this will be help to choose the phone...

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