After the initial rollout of the HTC Thunderbolt 4G LTE smartphone, the other two smartphones that are expected to feature LTE network are Samsung Droid Charge 4G and Motorola Droid Bionic 4G.

Here is a comparison of Motorola Droid Bionic, HTC Thunderbolt and Samsung Droid Charge.

Samsung Droid Charge is 129.7 x 67.5 x 11.5 mm and weighs 143 g, whereas Motorola Droid Bionic dimensions of 125.9 x 66.9 x 13.3 mm and weighs 158 g, also HTC Thunderbolt is 122 x 66 x 13 mm and 164 g.

The Droid Bionic, Thunderbolt and Droid Charge all have 4.3-inch 480 x 800 pixel displays. Droid Charge has Samsung’s Super AMOLED Plus capacitive touchscreen, while the other two feature TFT capacitive touchscreens.

Input features:
The input features found in Samsung Droid Charge are multi-touch, proximity sensor for auto turn on or off, accelerometer sensor for UI auto-rotate and light sensor. HTC Thunderbolt has input features like Gorilla Glass display, accelerometer sensor for UI auto-rotate, proximity sensor for auto turn-off, HTC Sense 2.0 UI and multi-touch input method. And the Droid Bionic has input features like multi-touch input method, accelerometer sensor for UI auto-rotate, proximity sensor for auto turn-off, touch-sensitive controls and Swype input method.

Samsung’s smartphone has 512 MB RAM, 512 MB ROM and 2 GB internal storage whereas HTC’s smartphone has 8 GB storage and 768 MB RAM. The Motorola’s phone has 16 GB storage, 512 MB RAM and 2 GB ROM. There is microSD support up to 32 GB for all the phones but extra 32 GB is included in HTC’s smartphone.

Since all the smartphone will be featuring Verizon’s network, all of them will have Rev. A up to 3.1 Mbps and LTE.

All the smartphones have Wi-Fi 802.11 b/g/n, DLNA, Wi-Fi hotspot, Bluetooth version 2.1 with A2DP and microUSB version 2.0 support. The HTC and Motorola have EDR support. Droid Bionic and Thunderbolt can serve as hotspot for up to 8 devices but Droid Charge serves 10 devices.

The 8-megapixel 3264x2448 pixels camera is found in all the smartphones with autofocus, geo-tagging and face detection. Both Droid Bionic and HTC Thunderbolt have dual-LED flash. Droid Bionic has image stabilization feature while Samsung’s smartphone has LED flash and smile detection as well. All the smartphone have secondary camera and can capture video at 720p.

Operating system:
The Android OS version 2.2 (Froyo) is found all of them but is upgradable to Gingerbread version.

The Samsung Droid Charge has a single-core 1 GHz Hummingbird processor compared Droid Bionic’s dual-core 1GHz ARM Cortex-A9 ULP GeForce GPU Tegra 2 chipset processor and HTC Thunderbolt’s single-core 1GHz Scorpion Adreno 205 GPU Qualcomm MSM8655 Snapdragon processor.

The Samsung Droid Charge has standard Li-Po 1600 mAh battery, the Motorola’s smartphone has a 1930 mAh battery and HTC Thunderbolt features 1400 mAh battery.

Other features:
The common features found in all the smartphones are SMS threaded view, MMS, Email, Push Mail, IM, HTML browser, A-GPS support, Java MIDP emulator, SNS integration, digital compass, Google Search, Maps, Gmail, YouTube, Google Talk, Picasa integration, organizer, voice memo-dial-commands and predictive text input.

Motorola Droid Bionic has an HDMI port, active noise cancellation with dedicated mic, MP3/WAV/WMA/AAC+ player, MP4/WMV/H.263/H.264 player and photo editor and viewer. HTC Thunderbolt has features like video Skype, built-in kickstand, MP3/AAC+/WAV/WMA9 player and DivX/Xvid/MP4/H.263/H.264/WMV9/player. And Samsung’s phone has image and video editor, MP4/DivX/WMV/H.264/H.263 player and MP3/WAV/eAAC+/AC3/FLAC player.

Verizon has confirmed that the Droid Charge will be arriving this Thursday April 28 and will be available for $299.99 on contract. The Let’s Talk and Walmart pricing is $249.99 with contract. And price without contract is $699.99. But there is significant price competition as Amazon has slashed the HTC Thunderbolt’s price to $130 with contract.

Motorola is confident that their smartphone is expected to do well. “We believe the Droid Bionic will have those same award-winning features [as previous Droid phones] and will be one of the best 4G LTE devices on the market.” The Droid Bionic is expected to be released in the second quarter. Motorola Droid Bionic smartphone is likely to come with the Webtop, one of the main elements that directed the public attention towards Motorola Atrix 4G.