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Another buying a used iPhone question
Posted by: Numo
Date: March 21, 2018 11:50AM
I found an iPhone on Craigslist that I’m interested in buying. The seller says it was originally locked to AT&T, but was subsequently unlocked by them. I want a totally unlocked phone so I can use it with any provider, including resellers. Will this tpye of unlocking come with any limitations that I should be aware of?
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Re: Another buying a used iPhone question
Posted by: testcase
Date: March 21, 2018 12:06PM
Get the EXACT model. Not all iPhone models are capable of utilizing ALL of the bandwidths currently in use (ie some models do NOT have CDMA capability). Once you know the exact model, check google or Wikipedia to see what carriers that it will be compatible with.

The used iPhone8+ is model A1684. There are MANY other models.

One link: [www.techwalls.com]

Note: the model IS listed in microprint on the back of an iPhone.



Edited 1 time(s). Last edit at 03/21/2018 12:07PM by testcase.
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Re: Another buying a used iPhone question
Posted by: Gareth
Date: March 21, 2018 12:19PM
Yea, AT&T models generally don't have CDMA bands, and thus would be limited to GSM carriers such as AT&T and T-Mobile. I haven't kept up with the LTE frequencies, and if that might carry over to traditionally CDMA carriers (i.e. Verizon and Sprint), but either way, you probably don't want a phone that ONLY works with LTE.
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Re: Another buying a used iPhone question
Posted by: billb
Date: March 21, 2018 12:22PM
If you're still looking for an SE you probably want the global/sprint model A1723
[everymac.com]
but if you have a specific network in a rare place in the country there's a small possibility there might not be enough band overlap/capability with that model.
[www.phonearena.com]

I would get the global model if there was a small chance you might end up on Sprint's network.



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Re: Another buying a used iPhone question
Posted by: testcase
Date: March 21, 2018 12:26PM
Yea, AT&T models generally don't have CDMA bands

I'll have to disagree with you on this. I bought my iPhone6s+ directly from ATT in November of 2015. Once my two-year contract was up, I had ATT unlock the phone and, had NO trouble switching it over to Verizon. I was told that the 6s+ (as well as a few other iPhone models) were "universal" and, when unlocked, could be used on ANY carrier. That's why I recommended that Ammo get the EXACT model and go from there.
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Re: Another buying a used iPhone question
Posted by: billb
Date: March 21, 2018 12:58PM
There were two USA models of the 6S Plus : 1634 and 1637
A1634 also had band 30 which is a band AT&T bought to utilize in congested areas where bandwidth was heavily congested.
Oddly enough AT&T did not necessarily distribute the A1634 exclusively.
When the 6s and 6s+ first came out if you wanted to be ensured of getting a band 30 inclusive model you had to buy the "sim-free" model from Apple directly.



The Phorum Wall keeps us safe from illegal characters and words
The doorstep to the temple of wisdom is the knowledge of one's own ignorance. -Benjamin Franklin
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Re: Another buying a used iPhone question
Posted by: Numo
Date: March 21, 2018 12:58PM
To add another twist, are certain models better for overseas use?
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Re: Another buying a used iPhone question
Posted by: NewtonMP2100
Date: March 21, 2018 01:01PM
....what they said....and it can vary depending on the iPhone model......



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Re: Another buying a used iPhone question
Posted by: Carm
Date: March 21, 2018 01:02PM
Quote
Ammo
To add another twist, are certain models better for overseas use?
Yes there are
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Re: Another buying a used iPhone question
Posted by: billb
Date: March 21, 2018 01:14PM
Quote
Ammo
To add another twist, are certain models better for overseas use?

Very generally:
Usa GSM uses 850/1900 bands
EU GSM uses 900/1800

so to go back and forth to EU you used to need a tri-band or quad-band GSM phone. I'm fairly certain that since iphone 5 all iphones have been tri-band or quad-band capable.
Back when phones were built with limited capabilities addressing network needs/uses this was an issue. I don't believe it is any more. At least for recent Apple iphones.
Apple has a band and frequency capabilities page. [www.apple.com]



The Phorum Wall keeps us safe from illegal characters and words
The doorstep to the temple of wisdom is the knowledge of one's own ignorance. -Benjamin Franklin
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Re: Another buying a used iPhone question
Posted by: Carm
Date: March 21, 2018 02:51PM
If you really want to include a twist. What about the order number?
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Re: Another buying a used iPhone question
Posted by: Buck
Date: March 21, 2018 04:05PM
I was told my Verizon iPhone 6 Plus was unlocked when I bought it. Is that true? How to check?
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Re: Another buying a used iPhone question
Posted by: billb
Date: March 21, 2018 04:22PM
Quote
Buck
I was told my Verizon iPhone 6 Plus was unlocked when I bought it. Is that true? How to check?

Probably the easiest way to check is to put another carrier's sim in the sim slot. If a popup box pops up wanting a sim unlock code you're locked.
If you can make a call you're sim-unlocked.
You may have to go thru some procedures to make data work though.

If you know someone who works at a phone store you might get them to check your phones' IMEI number to see its status.

Verizon was selling unlocked phones so it probably is.



The Phorum Wall keeps us safe from illegal characters and words
The doorstep to the temple of wisdom is the knowledge of one's own ignorance. -Benjamin Franklin
BOYCOTT YOPLAIT [www.noyoplait.com]
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Re: Another buying a used iPhone question
Posted by: tenders
Date: March 21, 2018 10:49PM
Verizon was required to sell unlocked phones for several years as penance for some atrocity they foisted upon its hapless customers. I think the 6S was part of that.
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Re: Another buying a used iPhone question
Posted by: Michael
Date: March 22, 2018 05:01AM
I've always wondered why Apple doesn't just make all of them universal. They'd only have 1 SKU for each model with a particular color and storage. That would be a marginal savings in a variety of ways, from Apple employee training to boxes and everything in between. There's gotta be a reason...
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Re: Another buying a used iPhone question
Posted by: RE:up
Date: March 22, 2018 05:54AM
Quote
Michael
I've always wondered why Apple doesn't just make all of them universal. They'd only have 1 SKU for each model with a particular color and storage. That would be a marginal savings in a variety of ways, from Apple employee training to boxes and everything in between. There's gotta be a reason...


That's one of the reasons that I still don't have a cell, the confusing array of what works where seems unnecessarily complicated to me. If I buy a Chevy, I expect it to be able to drive it on any road in the country or the world (yeah, I know, LH or RH drive). There simply are no Ford or GM or Toyota only roads. "It just works", what a novel concept.
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Re: Another buying a used iPhone question
Posted by: billb
Date: March 22, 2018 07:40AM
Quote
Michael
I've always wondered why Apple doesn't just make all of them universal. They'd only have 1 SKU for each model with a particular color and storage. That would be a marginal savings in a variety of ways, from Apple employee training to boxes and everything in between. There's gotta be a reason...

Qualcomm



The Phorum Wall keeps us safe from illegal characters and words
The doorstep to the temple of wisdom is the knowledge of one's own ignorance. -Benjamin Franklin
BOYCOTT YOPLAIT [www.noyoplait.com]
[soundcloud.com]
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Re: Another buying a used iPhone question
Posted by: D. Lawson
Date: March 22, 2018 11:56AM
Quote
billb
Quote
Michael
There's gotta be a reason...

Qualcomm

Yep.
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Re: Another buying a used iPhone question
Posted by: RE:up
Date: March 22, 2018 04:31PM
Quote
D. Lawson
Quote
billb
Quote
Michael
There's gotta be a reason...

Qualcomm

Yep.

???????!
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