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Thank you for pointing this out. I actually misquoted that line. The playoff game had just started so I was distracted, haha. Data is still via whatever you've chosen, including for iMessage, FaceTime, etc. My point stands there. And yes, only 1 cellular data line can be used at a time.

Expanding the quote and reading it more carefully, it actually refers to your outgoing "caller ID." I guess none of us read that very carefully! This is in line with my experiences of 2 lines (both on iMessage).

The below refers to the "Start New Conversations From" section in iMessage settings.

If I want to send a new (not previously threaded) iMessage to someone in the UK, my current choice is to start the thread from my US line. That's what this refers to. BUT if someone from the UK sends an iMessage to my UK #, I can respond from my US phone and it will reply back using my UK# and keeping the thread in tact (rather than coming from some US# they my not know). Anyway, I wish Apple wold fix this as I find it very annoying. I'm hoping that assigning a number/line to a contact fixes this but I guess we'll see.

So I'll reiterate: Both numbers and any email address you've registered to iMessage can be used regardless of what data line or WiFi you are on.


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That iMessage-toggling is unfortunate, IMHO. When I travel internationally, I would like to pop in a local prepaid SIM obtaining voice+SMS+data and continue to receive iMessage's targeted to my original number whether I'm on WiFi or walking about relying on cellular data. I would go out on a limb and opine that the vast majority of iPhone owners in the general public -- i.e. excluding tech-savvy people, like on here -- are completely unaware that one may configure iMessage aliases by way of email addresses. As such, it certainly would be more convenient to me if people could easily reach me via iMessage and vice-versa using my old number and without loss of a message thread. WhatsApp is able to do that. After installing WhatsApp initially, my primary, U.S. number was associated with the app. And, so, when traveling internationally and swapping out my old SIM for a local, prepaid SIM, my friends who used WhatsApp could still contact me using my original phone number. I did not have to tell them my new, temporary phone number in another country to message me with WhatsApp. And since that's a data-based service, then giving my US phone number to the locals in another country doesn't create any long-distance charges for them to text (or even call me) via WhatsApp. And, finally, of course, when I return home and swap my US-based SIM back in, the foreign friends can continue to reach me using my original phone number.

In summary, when I travel internationally I do not want to incur any roaming phone, SMS or data charges. I want to use a temporary prepaid SIM in that country giving me a local ph# for cellular calls and SMS, and allow me to use data. I'd also like my friends back home in the US to be able to continue to reach me by iMessage using my original US phone number via Wifi or cellular-data. However, it doesn't seem that the dual SIM iPhone's will provide me with that. Instead, I think I'm just better off with a single SIM that I swap out for a temporary one, and use WhatsApp (or even, better, the more recent "Signal" app instead which avoids some of the concerns with the former by some owing to its acquisition by Facebook).
 
That iMessage-toggling is unfortunate, IMHO. When I travel internationally, I would like to pop in a local prepaid SIM obtaining voice+SMS+data and continue to receive iMessage's targeted to my original number whether I'm on WiFi or walking about relying on cellular data. I would go out on a limb and opine that the vast majority of iPhone owners in the general public -- i.e. excluding tech-savvy people, like on here -- are completely unaware that one may configure iMessage aliases by way of email addresses. As such, it certainly would be more convenient to me if people could easily reach me via iMessage and vice-versa using my old number and without loss of a message thread. WhatsApp is able to do that. After installing WhatsApp initially, my primary, U.S. number was associated with the app. And, so, when traveling internationally and swapping out my old SIM for a local, prepaid SIM, my friends who used WhatsApp could still contact me using my original phone number. I did not have to tell them my new, temporary phone number in another country to message me with WhatsApp. And since that's a data-based service, then giving my US phone number to the locals in another country doesn't create any long-distance charges for them to text (or even call me) via WhatsApp. And, finally, of course, when I return home and swap my US-based SIM back in, the foreign friends can continue to reach me using my original phone number.

In summary, when I travel internationally I do not want to incur any roaming phone, SMS or data charges. I want to use a temporary prepaid SIM in that country giving me a local ph# for cellular calls and SMS, and allow me to use data. I'd also like my friends back home in the US to be able to continue to reach me by iMessage using my original US phone number via Wifi or cellular-data. However, it doesn't seem that the dual SIM iPhone's will provide me with that. Instead, I think I'm just better off with a single SIM that I swap out for a temporary one, and use WhatsApp (or even, better, the more recent "Signal" app instead which avoids some of the concerns with the former by some owing to its acquisition by Facebook).
Sorry but for what I understand you want to have iMessage, whatsapp... by Sim1’s number when going abroad
Yes you can. I’m using Sim1’s number for iMess and OTT app, with Sim2 for Data. It’s just you have using Sim2 as a wifi source. It doesnt mean you have to use imessage by sim2 when choose data on sim2 :D Please look at Pic 1 of my previous post. I’m using Sim Chinh (main sim) number for iMessage with data on Sim 4G (data sim)
 
My question is, can I get one of my hotspot lines into my phone along with my main phone line. Plan allows 10g of hotspot data through the phone. If I can get a hotspot line into my phone I can get unlimited or worst case 22g before it slows. Not typical in my experience. I want to use my second sim for data only so I don’t need to carry a hotspot and the phone.
 
My question is, can I get one of my hotspot lines into my phone along with my main phone line. Plan allows 10g of hotspot data through the phone. If I can get a hotspot line into my phone I can get unlimited or worst case 22g before it slows. Not typical in my experience. I want to use my second sim for data only so I don’t need to carry a hotspot and the phone.
Yes, yes you can.
It have option for the first time you put the Sim in (Use Simx for data only).
 
Sorry for the silliest questions, I'm a bit dense not the entire esim concept.

I have a US number (Verizon) I'm thinking I'd request an esim from them?
I travel to the UK on a regular basis (paying the VZW $10 day, would be nice to eliminate this)
Could I just get a Vodaphone or prepaid physical SIM there?

I also need iMessage to be seamless with my US contacts
I need to use Slack for my business communications
The occasional browsing

How would I pull that off?
 
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