Pocket Mail (as of 8/8/04)

As recently as mid-2001 there were four manufacturers—Palm, Sharp, Audiovox and Oregon Scientific—producing devices for the Pocketmail service. The Pocketmail Composer is the sole remaining device. The Composer is a 512K PDA with a built-in acoustic coupler that can access e-mail through pay phones, analog and most digital cellular phones. It features a small keyboard and screen and allows download of mail from POP3, IMAG and AOL accounts. It can be synchronized with popular e-mail software like Outlook. Its small size and ease of operation has made it a favorite for many members of the RV community.

Service plans are based on usage in North America. Generally, the plans include unlimited toll-free dial-up access and free WAP service for WAP-enabled PCS phones. Click here for review.

AMPS(as of 8/8/04) (Note: Retailers will tell you this is not available, but IT DOES STILL EXIST.)

4.8 Kbps - 9.6 Kbps

No network towers in national parks and rural areas

Best coverage in the USA

Some providers do not support roaming agreements & provide service only with use of credit card

Analog— also called Advanced Mobile Telephone System (AMPS)— is a Circuit-Switched system that divides geographic areas into small areas called cells. A cellular tower is built within each cell site. Each tower's coverage is 1 mile to 20 miles in diameter. A central computer in the system provider's office monitors the weakness/strength of the radio signals that emanate from a cell phone and can switch the cell signal from tower to tower as needed. Also the system can switch the cell call into the public telephone system. Each cell user occupies an entire frequency (no "sharing"), and there are a limited number of users allowed per tower.Most providers assign an area near the subscriber's address as being "home" with a flat service rate. Any cellular calls placed or received outside this "home" area are subject to "Roaming Charges." The Motorola S1936D Cellular Connection is the infamous "Black Box" used in the Phoenix One.

As of 6/17/02, both AT&T and Verizon have succeeded in eliminating any marketing support for their existing analog services to consumers. Analog transceiver devices and service plans are still available to large business customers like utilities and oil companies. A number of excuses ranging from the size of batteries to lack of interest by consumers have been raised by the major carriers as the reason for phasing this service out. However, the primary reason that the carriers have sought to eliminate analog service for consumers is that analog is inefficient and expensive for carriers to support at the usage levels used by most consumers. Analog service requires two channels to carry messages (either voice or data). Only one such communication can occur at any one time. Carriers using the newer coding techniques found in 2.5 and 3.0 generation digital phones can run hundreds of conversations and data sessions at the same time in channels formerly used one at a time for analog services. For large companies, the usage levels of the analog bandwidth meets the economic requirements of the large network providers, and they also purchase and deploy connectivity devices not used by consumers. AT&T does provide (unofficial) analog service to consumers at the rates shown above. But if analog were utilized at the consumer rate to check e-mail daily (30 minute per day) the cost would easily exceed $400 per month.

Rental Equipment

RIM Pagers

CDPD
(as of 8/8/04) (Note: This technology is incorporated into other products -- it's hard to find "pure" CDPD.)

E-mail access wherever analog service towers exist

CDPD requires a portable computing device, (PDA, laptop, or PocketPC-type), specialized software known as IP Stack software, a wireless modem, (a variety of PCMCIA cards) and a special wireless account known as an NEI which provides the IP address. It features always-on connectivity and supports a variety of compression technologies. Pricing is usually based on types of usage according to three classifications: same location (like an utility tower); mobile but consistent as to areas traveled; and unlimited, where no consistency of use is anticipated.
Each of the major carriers have different names for the basic CDPD coverage. (For example, AT&T's version is "Wireless Data Services", Verizon is "Mobile Wireless IP Internet," etc.) The chart above compares the basic types and products.

CDMA
(updated 11/04/02)

50 Kbps to 70 Kbps with peaks to 144 Kbps

Basic plan is limited to 2Mb of data transfer per month

12 - 125 Kbps

Some of phones are dual or tri-mode - so voice will connect in areas where data will not.

Works in areas where CDMA service is available

Limited to San Francisco, Los Angeles, Portland, Salt Lake City, eastern Texas, Michigan, Florida, and Eastern Seaboard

One price for data & voice

Uses Fourelle's Venturi compression software for enhanced performance

TDMA(as of 6/17/02)

12-14 Kbps

Five lines of text, no attachments

Provides direct access to AOL & Yahoo e-mail accounts

Voice & data on one PCS handset

PocketNet was originally introduced as a data-only system using TDMA digital service for consumers. It has now been incorporated into the business market and includes voice service. There is some doubt as to whether or not it can be purchased by consumers who are not a part of a corporate enterprise. A PCS digital phone is required, along with a general service digital calling plan. Coverage areas are substantially more limited than those for voice service. In November 2000, AT&T adopted GSM as the network of choice for third generation services, making the future of TDMA service unclear.

GSM/GPRS (as of 7/1/02)

75 Kb up and 150Kb down are expected but not confirmed as of this date.

High latency problems will make file transfer seem slower than data rates suggest.

Ability to receive voice calls while sending/receiving data. E-mail, corporate applications, news & weather on enhanced web sites

"Always on"

$3 to $13/ mo for 50Kb to 2Mb + additional 1¢/Kb

2-way text messaging for about $5/month

iDEN (as of 6/17/02)

45-55 Kbps*
Available in only 190 metro areas

VPN is not supported

Phone, data, and "Direct Connect" 2-way radio service on one bill

No ISP required; no roam charges

Globalstar GSP-1600 (as of 6/17/02)

7.7 Kbps

Satellite will not work indoors or in deep canyons.Phone is larger than most handsets.

Car kit is prohibitively expensive.

As a tri-mode phone, can access analog (AMPS), digital (800 MHz CDMA) and satellite service.

Also supports text messaging (4 lines of 12 characters each)

Five service plans ranging from:$25/month for 5 minutes to $400/month for 500 minutes, plus $10/month for voice mail.

Orbcomm

Inmarsat Satellite System