As AT&T has lost its grip over the Apple iPhone in the U.S., the company plans to attract new customers by luring them to its Android phones, among them the HTC Inspire and Motorola's Atric 4G. Here is a spec by spec comparisons of both.

The HTC Inspire 4G is bigger and heavier with 122.9 x 68.1 x 11.7 mm dimensions and weighing 163.9 g compared to the Motorola Atrix 4G which is 117.8 x 63.5 x 10.1 mm and weighs in at 136 g.

The Inspire 4G has a 4.3-inch 480 x 800 pixels S-LCD capacitive touch-screen display as against Atrix 4G's 4-inch 540 x 960 pixels TFT capacitive touch-screen. The Inspire 4G's S-LCD display is the latest model of LCD, not yet carried by most other phones.

Input features:
The input methods offered in the Inspire 4G are accelerometer sensor for UI auto-rotate, proximity sensor for auto turn-off, HTC Sense UI and multi-touch input method. Atrix 4G features a biometric fingerprint reader, touch sensitive controls, MOTOBLUR UI with Live Widgets, multi-touch input method, accelerometer sensor for UI auto-rotate and proximity sensor for auto turn-off.

The Inspire has 768 MB RAM with 4GB internal storage capacity whereas Atrix 4G has 1 GB RAM equivalent to few of the notebook computers along with 16 GB internal storage. Both smartphones have microSD support up to 32 GB but Inspire 4G has an extra 8 GB included.

As these smartphones are on AT&T's network, the users can enjoy 14.4 Mbps HSDPA and 5.76 Mbps HSUPA.

The Wi-Fi 802.11 b/g/n DLNA, Bluetooth version 2.1 with A2DP EDR and microUSB 2.0 are present in both of these phones but Inspire 4G is AT&T's first device to offer the mobile Wi-Fi hotspot feature to connect eight devices.

HTC's smartphone has an 8-megapixel 3264x2448 pixel camera along with autofocus, dual-LED flash, geo-tagging and face detection. But Atrix 4G comes with 5-megapixel 2592?1944 pixels camera with autofocus, LED flash, geo-tagging and image stabilization.

The Atrix can capture video at 720p similar to Inspire 4G, but also has an added advantage with a secondary VGA camera which is not found in Inspire 4G. Moreover 1080p video capture is expected in Atrix via future update.

Operating System and Processor:
The Android version 2.2 (Froyo) operating system is present in both the smartphones. When it comes to the processor, Inspire 4G has a 1GHz Scorpion Adreno 205 GPU Qualcomm MSM8255 Snapdragon compared to Atrix's mega dual-core 1GHz ARM Cortex-A9 ULP GeForce GPU Tegra 2 chipset.

The latest news on HTC Inspire 4G, according to gizmocrunch, shows the HTC Inspire 4G overclocked to 1.8GHz. While we were sitting here, twiddling our thumbs and waiting for AT&T to enable HSUPA, the team over at XDA Developer forums have managed to overclock the HTC Inspire's 1GHz Snapdragon processor to a whopping 1.8GHz! the blog said.

Surprisingly Inspire 4G has a standard Li-Ion 1230 mAh battery which has less capacity compared to many other smartphones available in the market.Atrix has a standard Lithium 1930 mAh battery. But the standby time offered by Inspire 4G is up to 372 hours along with 6 hours of talk time whereas Atrix 4G gives a standby time up to 250 hours and 9 hours of talk time.

Common features:
The common features of both smartphones are loudspeaker, 3.5mm jack, SMS threaded view, MMS, Email, IM, Push Email, HTML browser, stereo FM radio with RDS, games, A-GPS support, Java via third party application, digital compass, Google Search, Google Maps, Gmail, YouTube, Google Talk, Facebook & Twitter integration, Adobe Flash 10.1 player, voice memo-dial-commands and predictive text input.

And other features found on the Inspire 4G include dedicated search key, picasa integration, MP3/AAC+/WAV/WMA9 player and DivX/Xvid/MP4/H.263/H.264/WMV9/player. Meanwhile Atrix features an HDMI port, active noise cancellation with dedicated mic, MP3/WAV/WMA/eAAC+ player, 1080p MP4/H.263/H.264.WMV/Xvid/DivX @ 30 fps playback, MySpace integration, photo viewer and editor, organizer and document editor.

HTC Inspire is priced at $99 and Atrix 4G is priced at $149.99.