receiving 2 factor authentication while abroad

Kenr · Post by **Kenr** » Sun Feb 11, 2024 8:07 pm

BklynBoy wrote: ↑Sat Feb 10, 2024 8:38 pm
Kenr wrote: ↑Sat Feb 10, 2024 8:31 pm
BklynBoy wrote: ↑Sat Feb 10, 2024 8:07 pm
Kenr wrote: ↑Sat Feb 10, 2024 9:23 am OP, how long are you going to be traveling outside of the U.S.?
2 months.
You should be okay getting SMS overseas while using Wi-Fi with your US carrier. Usually you will have a problem when it’s over 90 days, usually they will freeze your service until you return to the U.S.

Just a recommendation, DO NOT turn roaming on, you will get killed on roaming charges.

Who is your cell phone carrier?
I use MetroPCS . I spoke w/ someone at MetroPcs and they added something called "Global Voice metro by Tmobile) 10 dollars extra per month They also said I can turn data roaming on. ( since I know within an hour or so of when i should be getting this text- I can turn roaming on and then shut off)

Last summer i did get text messages on my phone when i was using Wi-Fi but it was spotty. That was possibly because my apartment wifi wasn't the best. I was thinking in worst case I can go to Starbucks and use their wifi When i need the banking codes. I have someone in NYC that can initiate the process BUT they send a code to my NYC number and i cannot change it

It's a little confusing to me how a local sim would help this situation. The local sim gives me data correct? and that can help get texts from NYC? again you can ignore this part if sounds crazy.

You should be okay then given that you are paying extra for the service.

BklynBoy · Post by **BklynBoy** » Mon Feb 12, 2024 5:40 am

UPdate!!!
I called back MetroPcs to ask something else and then also confirmed about the 10 dollar international monthly option. The guy said I got the wrong one and it was only for MExico and Canada. Everytime I call , the person says something different. It seems to be a language barrier and they outsource the calls to India or something

Anyway he added the correct service which costs the same ( 10 bucks) AND I still felt uncomfortable because who the hell really knows?

I just texted my friend in Cambodia and he responded to me a few hours later ( he was sleeping) and he got the text!!
I sent the text not thru an app. Just regular text as if i would send a regular text to someone in NYC.

Sorry if rambling but now feel relieved. At least i know I can send texts to Cambodia-- which I hope means I can receive the authorization codes I need

stevenjb · Post by **stevenjb** » Mon Feb 12, 2024 6:19 am

Add a VPN service to your phone and point it to an SEA country, activate WiFi calling and have someone text your phone number.

ressl · Post by **ressl** » Mon Feb 12, 2024 6:40 am

Kenr wrote: ↑Sun Feb 11, 2024 7:44 pm That’s funny because I don’t use roaming or cellular data on the phone with my US sim and I get SMS from my bank and text messages when I do turn on that phone using Wi-Fi.

It is impossible to get a SMS by WiFi. However, there are a couple of options now:
1) roaming can get activated twice: roaming at all and roaming for cellular data. You explicit mention you don't use cellular data in connection with receiving SMS, which puts a big question to the overall statement, since a SMS is completely independent of data. To me it looks like you have roaming activated, but disabled for data - the WiFi part you mention is completely irrelevant (you can verify this by trying to receive a SMS with deactivated cellular data and deactivated WiFi).
2) you are using an iPhone and your bank and whoever is sending you an SMS is actually not using SMS, but iMessage. Both are shown in the same app, but greatly differ in the way they get transported to your phone. iMessage depends on data, while SMS is just cellular network (note: NOT cellular data!). You can verify this by putting the SIM into an Android phone or feature phone and try to receive a SMS by WiFi
3) your bank is using another way of transmitting the code, mostly by an additional app (but this is unlikely)

Kenr · Post by **Kenr** » Mon Feb 12, 2024 7:19 am

ressl wrote: ↑Mon Feb 12, 2024 6:40 am
Kenr wrote: ↑Sun Feb 11, 2024 7:44 pm That’s funny because I don’t use roaming or cellular data on the phone with my US sim and I get SMS from my bank and text messages when I do turn on that phone using Wi-Fi.
It is impossible to get a SMS by WiFi. However, there are a couple of options now:
1) roaming can get activated twice: roaming at all and roaming for cellular data. You explicit mention you don't use cellular data in connection with receiving SMS, which puts a big question to the overall statement, since a SMS is completely independent of data. To me it looks like you have roaming activated, but disabled for data - the WiFi part you mention is completely irrelevant (you can verify this by trying to receive a SMS with deactivated cellular data and deactivated WiFi).
2) you are using an iPhone and your bank and whoever is sending you an SMS is actually not using SMS, but iMessage. Both are shown in the same app, but greatly differ in the way they get transported to your phone. iMessage depends on data, while SMS is just cellular network (note: NOT cellular data!). You can verify this by putting the SIM into an Android phone or feature phone and try to receive a SMS by WiFi
3) your bank is using another way of transmitting the code, mostly by an additional app (but this is unlikely)

Please don’t tell me it’s impossible because I’ve done it over half a dozen times since I’ve been here. I don’t roam and my cellular data is turned off. It doesn’t come through IMessage and doesn’t come through an app. I don’t need to try anything because I already know everything is turned off except Wi-Fi when I use it.

And it’s not just SMS from my bank, it’s from three (3) different sources.

BklynBoy · Post by **BklynBoy** » Mon Feb 12, 2024 10:58 am

I also got sms messages last year over wifi.. i didnt have anything else like international roaming added but i do now. Last year tho it wasnt consistent. I NEED IT CONSISTENT. thats why making sure before i go

ressl · Post by **ressl** » Mon Feb 12, 2024 5:12 pm

I had now an excessive search about that on the internet and 99% of the articles describe, how to send an SMS over WiFi. However, here it goes into the other direction - receiving. As mentioned before, not much can be found, but it looks like there is indeed a way. The carrier needs to support Wi-Fi Calling as well the option VoIP calls (not to confuse with VoLTE) and "WiFi assist" needs to be activated in your phone. This seems to tunnel the GSM protocol over the internet to the service provider. Honestly, I have never heard of this before, but will try, since I suffer of the same issue with ACLeda

Kenr · Post by **Kenr** » Mon Feb 12, 2024 5:56 pm

Well I don’t activate a Wi-Fi assist on my current IPhone, don’t know if it has it, and I didn’t activate a Wi-Fi assist on my Samsung, if it even had it, while vacationing in Thailand for many years to send text messages back and forth back home, never did any banking while on vacation.

I just have everything turned off and turn Wi-Fi on and everything is good. No Wi-Fi calling, no roaming, no cellular data is on.

Your issue could be with your carrier and that your service is out of Cambodia, but I don’t have such an issue with T-Mobile.

phuketrichard · Post by **phuketrichard** » Mon Feb 12, 2024 6:15 pm

why cant u just leave ur US sim card in the phone?, OFF<
till u need to receive a code and than turn it on>
you dont need wifi calling for that
just make sure ur US sim/number allows international use

OR u cant receive in Cambodia>

I had to tell Citi bank in the states that i live in Thailand an now i get sms from them on my thai Tel number( nothing to do with internet) when I need enter codes

Kenr · Post by **Kenr** » Mon Feb 12, 2024 6:44 pm

Not paying attention. I don’t take the sim out of the phone. I don’t need Wi-Fi calling turned on because it works over Wi-Fi. I receive SMS fine.

And my bank will not send SMS to a foreign number. I need an active US number in my name.

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