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Thread: International Roaming on Verizon

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    International Roaming on Verizon

    Is Verizon a provider for for folks that come to the USA from abroad? In other words, do folks with cell phones from other parts of the world default to Verizon for roaming in the USA? If yes, what service providers have a roaming agreement for roaming in the USA on Verizon?

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    International Roaming on Verizon

    Quote Originally Posted by CellGeek View Post
    Is Verizon a provider for for folks that come to the USA from abroad? In other words, do folks with cell phones from other parts of the world default to Verizon for roaming in the USA? If yes, what service providers have a roaming agreement for roaming in the USA on Verizon?
    Im not aware of any non USA carrier that allows Verizon roaming. UK, Germany, Poland, Singapore, Italy, and various other sims I’ve tested from several carriers in those countries only allow AT&T or T-Mobile roaming.


    Which is mostly because they have GSM for voice as there’s generally no VoLTE roaming. Which would make Verizon data only as Verizon doesn’t have GSM voice only VoLTE or CDMA

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    There is no single provider like you mentioned. Check with your provider where you live to determine which cellular providers that the have roaming agreements with and confirm what carriers are supported using your phone are.

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    It's only AT&T and T-Mobile, because the requirement to have compatible voice with the GSM standard. AT&T does not have GSM anymore, so the only pure GSM remains T-Mobile.

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    Quote Originally Posted by SoNic67 View Post
    It's only AT&T and T-Mobile, because the requirement to have compatible voice with the GSM standard. AT&T does not have GSM anymore, so the only pure GSM remains T-Mobile.
    Att still has HSPA which calls can be made on at least.


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    I don't think that At&t has shut down their GSM networks and likely won't until 2022. If I am mistaken, please post any relevant information.

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    Quote Originally Posted by veriztd View Post
    I don't think that At&t has shut down their GSM networks and likely won't until 2022. If I am mistaken, please post any relevant information.
    AT&T shut down there base GSM network already back in 2016. They do have WCDMA HSPA though.

    But T-Mobile is the only major carrier left with base plain GSM/GPRS


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    Quote Originally Posted by CellGeek View Post
    Is Verizon a provider for for folks that come to the USA from abroad? In other words, do folks with cell phones from other parts of the world default to Verizon for roaming in the USA? If yes, what service providers have a roaming agreement for roaming in the USA on Verizon?
    This link provides a few reasons why VoLTE roaming isn't common.
    I suspect that reasons 1-3 apply to Verizon and potential roaming partners.
    Obviously #4 doesn't apply to Verizon because inbound roamers are expected to be using devices with UMTS/WCDMA and Verizon phasing their CDMA network in one year.

    https://blog.wedotechnologies.com/vo...-are-you-ready

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    T-Mobile MVNO (UltraMobile) offers a 3 week tourist SIM for US visitors over the T-Mobile US network. GSM, UMTS, LTE et al.

    This offers our international visitors 1000 minutes of domestic talk, unlimited domestic and international messaging, 2GB’s of LTE data and unlimited-reduced speed data.

    Even though these plans are managed by UltraMobile they can be purchased at T-Mobile Brand retail or T-Mobile Preferred retail establishments.

    This is naturally meant to be a temporary service offering and does not allow for top-up’s or reactivation beyond the 3 week allotment.

    https://www.ultramobile.com/tourist/
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    Quote Originally Posted by hyelton View Post
    Att still has HSPA which calls can be made on at least.
    Yes, if your phone was already accepted on network.
    A foreign carrier phone from Europe will start scanning for an anchor in the GSM part first, so they will receive the T-Mobile handshake first. And they will roam on that.
    My phone, in Europe roaming, starts scanning with the GSM part too.
    The fact that T-Mobile parent company is Deutsche Telekom probably also helps contractually.

    Also note that UMTS/WCDMA in Europe/Asia is on different bands, (UTRA bands 1 and 8), so their phones might not even work in US bands (UTRA bands 2 and 5, or 4 in T-Mobile case).

    https://en.wikipedia.org/wiki/UMTS_f...ion_(UMTS-FDD)


    Quote Originally Posted by i0wnj00 View Post
    This link provides a few reasons why VoLTE roaming isn't common.
    Obviously #4 doesn't apply to Verizon because inbound roamers are expected to be using devices with UMTS/WCDMA and Verizon phasing their CDMA network in one year.
    Verizon will shut down both their 2G (CDMA) and 3G (CDMA2000 EV-DO) networks. They never had UMTS/WCDMA.
    Since VZW 3G was never able to carry voice anyway (the DO comes from Data Only), it's irrelevant.
    Last edited by SoNic67; 01-02-2020 at 12:04 PM.

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    Since Verizon does not host roamers from other countries on their network, now it is clear to me why Verizon can’t exactly match the $10 per day roaming abroad deal that is offered by ATT. Verizon’s $10 per day travel pass plan throttles data to 2g speeds if you use more that .5 GB per day, whereas with the same plan on ATT there is no throttling. I am sure this is due to bilateral roaming agreements with providers abroad that ATT has and Verizon does not.

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    Recently I discovered Airalo, an app for Android and iOS that utilizes certain eSIM-enabled phones to purchase data eSIMs for many countries around the world. For the US, it seems to use StarHub (a Singaporean provider). On the app, it lists which networks the data SIM will roam on in any given country. In our case, it seems that they have roaming agreements with T-Mobile and Verizon. I can in fact confirm after giving the service a test shot that it does indeed work. You do get access to either T-Mobile or Verizon depending on where you are or your personal preference if you manually select the network. On iOS at least (unable to speak to Android users), the signal bars for Verizon don't show up, even though you're connected. For T-Mobile they do. Also, it will display 4G instead of LTE, which might be confusing at first for T-Mobile users.

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    There's a lot of misinformation in this thread.
    International 3GPP (i.e. GSM) roaming depends on a number of factors: 1) intercarrier roaming agreements 2) phone compatibility 3) SIM and phone based PRLs 4) potential LAC and technology blocking, etc. Assuming that two carriers have mutual roaming agreements, the next hurdle is phone compatibility. Most Global phones lack many US bands (e.g. 12, 13, 17, 71, etc) This means that the roamer's phone has to locate a carrier it can roam on, on a band it has, using an air-interface it understands and which is not blocked for roaming. (This often means AT&T or T-Mobile's band 2 or 5 WCDMA.) Most phones search for signals starting with their best technology (e.g. LTE) and work progressively down the scale (e.g. LTE -> WCDMA -> 2G). Many foreign carriers block LTE for roamers (I have no idea why). When a phone finds a compatible signal, it checks it against its PRL and keeps looking. Once it's done, it picks the signal from the carrier that's highest on the PRL and attempts to register on the network. This involves sending an encrypted registration request through the roamed carrier to the home carrier which includes the MNC and LAC (Location Area Code). If for some reason, the home carrier doesn't like the MNC or LAC, the registration request will be denied. The LAC is a code for a region of a carrier's coverage. It could be as big as their entire network or as small as a single cell. (T-Mobile uses a lot of LAC-blocking to control domestic, and perhaps international, roaming). The phone works its way progressively down the PRL-sorted signal list until it either succeeds in getting a registration approval or it gives up and starts over. This constant retrying is one reason why searching for a carrier eats up so much battery.

    Having said all this, I have no idea if Verizon allows any foreign roaming on their LTE network. They used to be big into international CDMA roaming, back when CDMA was giving GSM/UMTS a run for their money. I have not checked recently but I'd assume that there aren't all that many international CDMA carriers left.
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    Quote Originally Posted by CellGeek View Post
    Since Verizon does not host roamers from other countries on their network, now it is clear to me why Verizon can’t exactly match the $10 per day roaming abroad deal that is offered by ATT. Verizon’s $10 per day travel pass plan throttles data to 2g speeds if you use more that .5 GB per day, whereas with the same plan on ATT there is no throttling. I am sure this is due to bilateral roaming agreements with providers abroad that ATT has and Verizon does not.
    Just to ask, because I’m not sure, is that 2G speed 128kbps or 600kbps or something else?

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    Quote Originally Posted by DebiLee View Post
    Just to ask, because I’m not sure, is that 2G speed 128kbps or 600kbps or something else?
    2G speed = 128kbps - https://www.verizonwireless.com/supp...ge-base-16543/

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