Amazon has the very popular upcoming Samsung Galaxy S4 - 4G Smartphone Pre-Order for $149.99 +  Free 2 day Shipping.
New 2 year plan is required. Release date is 4/27.

The Samsung Galaxy S4 upgrade phone option is $249.99. Buying the phone without the plan is $699.99.

About:

This is a 4G Smartphone running on the Sprint Network. Not as popular but good coverage and lower initial and monthly costs than Verizon or AT&T.

Sprint 450 minute Everything Data Plan with unlimited data, text, web $69.99/month.

Be sure to read our article: iPhone vs. Android: Making the best Choice

The Galaxy S4 has an improved battery. Fast quad core processor and huge 5 in screen.

The Samsung Galaxy S4 differences compared to the Samsung Galaxy S3:

• 5-inch Super bright Display
• Full HD 1920x1080 resolution
• 1.9GHz quad-core processor
• 2 GB RAM
• 13MPixel Camera Dual Shot
• Ships with Android 4.2.2 (Jelly Bean)

Samsung Galaxy S IV Specifications:

• Color: Black
• 5-inch Full HD Super AMOLED touchscreen display (1920 x 1080 pixels)
• 1.9GHz quad-core processor
• 2 GB RAM
• 16GB built in storage
• 13MPixel camera w/ 1080p video capture
• Bluetooth 4.0
• Android 4.2.2 (Jelly Bean)
• MicroSD slot for expansion slot (up to 64GB)
• Wireless N Wi-Fi
• Near Field Communication (NFC) for transactions, data exchanges and other short-range wireless interaction.
• Built in IR Blaster
• 4.6 ounches
• 5.4 x 2.75 x 0.3 in