All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: photography and

Thank you for buying via links and ads on this site,
which earn me advertising fees or commissions.
As an Amazon Associate I earn from qualifying purchases.

Other World Computing...
B&H Photo...
As an Amazon Associate I earn from qualifying purchases.
Upgrade the memory of your 2018 Mac mini up to 64GB
Today’s Deal Zone Items... Handpicked deals...
$1199 $779
SAVE $420

$250 $200
SAVE $50

$1699 $1299
SAVE $400

$1499 $1149
SAVE $350

$200 $140
SAVE $60

$89 $69
SAVE $20

$120 $35
SAVE $85

$178 $148
SAVE $30

$3498 $2998
SAVE $500

$3699 $1299
SAVE $2400

$1000 $700
SAVE $300

$3899 $1499
SAVE $2400

$748 $648
SAVE $100

$2999 $1999
SAVE $1000

$1699 $999
SAVE $700

$1698 $1398
SAVE $300

$4499 $4499
SAVE $click

$1399 $1049
SAVE $350

$1149 $799
SAVE $350

$1399 $1049
SAVE $350

$1498 $1198
SAVE $300

$2797 $2597
SAVE $200

$280 $250
SAVE $30

$799 $499
SAVE $300

$699 $699
SAVE $click

$1699 $1299
SAVE $400

$8399 $7599
SAVE $800

$899 $799
SAVE $100

$1699 $1299
SAVE $400

I’ve ordered my iPhone 4S, and What About Two Networks at Once?

I’ve ordered my iPhone 4S, and looking forward to it from my aging iPhone 3Gs.

When you buy from Apple, the links on this site to Apple or our advertiser OWC gets us credit, a great way to support what you’ll find on this site, thank you.

One question I’ve not seen answered is that as a “world phone” compatible with both GSM and CDMA, can the iPhone i4S simultaneously be on the AT&T and Verizon networks?

It seems to me that if a phone has dual antennas and corresponding chipsets for the GSM and CDMA standards (and maybe it does not), then it ought to be able to work on either or both networks at the same time. That would be a GREAT feature.

One reader read this and got off on a tangent about roaming, I am simply saying I want one phone that can simultaneously accept or make calls on either AT&T or Verizon. That would be wonderful— two numbers on one phone so that coverage quality would be greatly enhanced in some areas where only one of the vendors has a decent signal.

Lorenzo Z writes:

The global feature on the iPhone is used for those that pick a CDMA carrier in the US (Verizon or Sprint) so they can roam on GSM networks in most other countries. The previous Verizon iPhone 4 would be totally useless in countries with only GSM networks for example. The carrier you choose and sign a contract with and which subsidizes the phone will be your only carrier in the US. But, that specific carrier has roaming agreements in certain areas (for example Sprint sometimes lets you roam on Verizon's network), but you can't pay 2 carriers for service simultaneously (like AT&T and Verizon).

Also, on the iPhone specs from the Apple website under footnote 4 says: CDMA available only if iPhone 4S is sold and activated for use on a CDMA network.

Not sure if that means the CDMA radio is "locked" down, or if it doesn't have the hardware at all.

Verizon and Sprint have sold many "global" phones, for the sole purpose of being able to use it abroad on a GSM network. It may be possible to unlock your phone and switch SIM cards to pick another network, but CDMA phones can only be activated by the carrier (no SIM... but it could be different with the iPhone 4S).

Basically, the answer is no, you cannot simultaneously use, or choose on demand, AT&T and/or Verizon. Lastly, I believe neither have mutual roaming agreements because of their different technologies, and competitive nature.

Even if you pay both AT&T and Verizon separately, you can't have your phone registered on both networks (even after unlocking).

Hope that makes sense and answers your question,

MPG: the convoluted balkanization schemes of cellphone companies defeat a simple and basic need: two phone numbers on two networks active simultaneously for overall superior coverage where one carrier is weak or absent.

Funny how Steve Jobs never fixed that one for iPhone users, but one brilliant star can't fix all problems and it’s too late now. It appears that the only solution is to carry both an AT&T phone and Verizon phone, but after looking at pricing with data plans, I think I’ll be sticking to a single AT&T phone.

OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available

Great for travel or for desktop!
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.


√ No more slow and noisy hard drives!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.

Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!
OWC Envoy Express

World’s first Thunderbolt 3 M.2 NVME SSD enclosure.

Super fast, bus-powered, 3.3 oz, DIY easy, rugged and compact!

See also OWC Express 4M2
√ No more slow and noisy hard drives!
View all handpicked deals...

LG UM7370PUA 70" Class HDR 4K UHD Smart LED TV
$1199 $779
SAVE $420 | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__