Casio G'zOne Rock

AKA: Casio C731, Hitachi Rock
6.5/10 AVG.
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The G'zOne Rock fails to be as tough as its predecessor, the G'zOne Boulder, but adds new apps that make it a good niche phone for adventure-types.

- Sean Ludwig , PC Magazine 
PC Magazine

Specs summary


The Casio G'zOne Rock's screen is 2.1 inches with 240 x 320 pixels resolution.


The phone runs on the Other operating system (OS).

2+ MP
You can take photos or capture video with the phone's onboard 2+ megapixel camera. There's no secondary front camera.
76 MB

Internal memory is 76 MB. An external, MicroSD (up to 16 GB) expansion slot is available for increased storage capacity.


The phone is powered by a 1150 mAh Lithium-Ion (Li-Ion) battery. Casio's performance ratings are 26.5 days standby time, 300 minutes talk time.

Prices (Where to Buy)

New Casio C731 G'zOne Rock Verizon Cellular Phone Pageplus Verizon 9.9/10

from eBay

  • Condition: New
  • Availability: In Stock
  • Contract: No
  • Located in: USA

Casio G'zOne Rock C731 (Verizon) Bad Ext LCD/Inner Glass, Won't Make Call

from eBay

  • Condition: For parts
  • Availability: In Stock
  • Contract: No
  • Located in: USA

Casio G'zOne Rock C731 - Black (Verizon) Cellular Phone Clean ESN Rugged

from eBay

  • Condition: Used
  • Availability: In Stock
  • Contract: No
  • Located in: USA


Manuals / User Guides
Helpful Links
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Visit the Casio G'zOne Rock Q&A Forum to ask the community a question or help others.

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Reviews (6.5/10 Avg. rating)

Very appealing to outdoors types, but anyone looking for advanced multimedia capabilities might be disappointed

from PCWorld (6 years ago)

As a phone that can go from a fishing trip to the boardroom to the hip pocket of a hopeless klutz, the Casio G'zOne Rock holds its own, but it won't wow people who need better text or Web connectivity.


The G'zOne Rock can take a decent beating and is waterproof, but it wasn't as rugged as its predecessor

from PC Magazine (6 years ago)

The Casio G'zOne Rock on Verizon Wireless appears to be a seriously rugged feature phone, but it's not as rugged as we had wished. It's tough enough to handle a hiking or boating trip, and features six outdoors-centric applications including a pedometer, thermometer, and lunar calendar. The tradeoff... More


The ultimate all-in-one phone for the outdoors enthusiast

from Cnet (6 years ago)

The Casio G'zOne Rock is military-certified to withstand a variety of environmental hazards, plus it features outdoor-specific applications like a compass and a thermometer. It also has EV-DO Rev. A, Push-to-Talk, GPS, a 2.0-megapixel camera, and more. The Rock is certainly a rugged handset made for... More


I have no problem with the rock

(2 years ago)

good battery life, i can set it to be on all the time when opened and still get a week per charge only downside is the charging cradle as it is a snug fit


Completely disapointed

(5 years ago)

The processor needs to be improved. I open the flip phone and I have to wait for the phone to react (light up). Delayed key response when texting or dialing (my most fustrating complaint). User interface is minimal at best. When speaking from time to time people have a hard time listening (the mic a... More


The Rock

(5 years ago)

HORRIBLE phone... cant wait to get a new one. Piece of sh*t was on the charger perfectly fine. Then It randomly turned off and never turned back. O and because Its a little worn I have to pay $50 to get a new one. And by worn I mean no scratchs on the screen but scratches on the black outing tha... More


Horrible Phone

(5 years ago)

This is not a rugged phone by a long stretch. Have only had it two months, in that time it freezes regularly, takes forever for button inputs to register, and the cradle charger stopped working. This supposedly "rugged" phone dropped from my pocket to the ground and the screen shattered. Although... More


Only Saving Grace- Waterproof

from Amazon (5 years ago)

The only reason I got this phone was because it is waterproof. I was spending more on insurance from drowned phones than it was worth. My only choice of waterproof phones at our local Verizon store was this Casio or another brand which was 3 times as expensive and would have required me to upgrade m... More


Worst phone I've owned

from Amazon (5 years ago)

The charger on this phone failed in the first two weeks and was replaced by the store. The phone microphone became so unreliable and weak at 6 weeks that the phone became worthless without a bluetooth headset. The phone was never dropped or much for ruggedness. Warranty support is non-ex... More


A Reliable Phone

from Amazon (5 years ago)

Likes: Sound quality Rubberized exterior 1-button flip-to-open Bright display Customizable buttons Included software: compass, sunrise/sunset times (I use this frequently) Sound quality when using a wired earpiece (I don't use bluetooth stuff) Dislikes: Small front display Thickness is mor... More


Improve sound quality - don't cover the mic!

from Amazon (5 years ago)

I bought the first G'zone model when it first came out. My husband still uses it, he is an electrician, and we live on a lake. You just can't break these phones! I switched to a smartphone, after ruining a few I decided I needed to back to the G'zone. I have noticed quite a few reviews that me... More


Best Phone i have ever owned!

from Amazon (5 years ago)

I had the Casio G'Zone Type S (One of my favorite phones of all time) before the Rock and this is another great phone they have added to the line up. The only con if any is that it can react a little slow some times to the buttons you press and when you have the phone resting on your shoulder to ta... More


Good overall, but not without faults

from Amazon (5 years ago)

Let me start out by saying that my previous phone was a Motorola Razr V3xx for reference. The voice quality seems just fine to me. No problems with what i hear, & no one has complained about how i sound, either. I text a fair amount (probably 200 texts a month or so). Texting is more of a h... More


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