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What is the best phone for seamless international calling between the USA and Thailand?

phone recommendationsdual SIM compatibilityinternational phone useoperating systems (iOS, Android)eSIM functionalitycommon phone brandsnetwork compatibility
May 4, 2024
6 months ago
Jack ****************
ORIGINAL POSTER
The last phone I bought was an Oppo something something with two SIM slots. Even with my US SIM the phone cannot make calls in the USA. I do some work travel and it's a big pain. Does anyone have a brand or other suggestion for my next phone so that I can have full functionality in both places?
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TLDR : Answer Summary
The user is looking for a smartphone that can function well in both the USA and Thailand, particularly for making calls while traveling. Community suggestions include various smartphones known for their compatibility across different networks and countries, primarily mentioning brands like Apple and Samsung, along with a note on ensuring the phone is unlocked and able to support multiple SIMs or eSIM technology to facilitate easy use of local networks when abroad.
Simon ********
Pixel
6 months ago
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Christian **********
Check the website "willmyphonework" Except for the most high-end phones, many phones are marketed to geographic regions and will offer frequencies and bands most frequently used in those regions. High-end phones offer a wider array of frequencies/bands that cover more geographic areas
6 months ago
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David **********
Use Apple all over the world, roaming with 2 SIMs, USA and Thailand. (Didn’t go to Africa)
6 months ago
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James **************
I had already purchased my phone long before my trip but what I ended up doing was bringing a spare phone, purchased a sim card for it, turned on a hotspot and then connected to it with my normal phone and enabled WiFi calling. I kept my normal phone number and all and it called like a normal connection and I'm from the US .
6 months ago
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Osama ************
I have been using the OnePlus phone for several years and it always worked without any issue every where I go.

My only advice is to buy it in the USA
6 months ago
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Phil ********
@Osama ***********
 What if its SIM locked in USA? How can they use it here?

Bad advice really.
6 months ago
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Osama ************
@Phil *******
 No it is not locked. Because you have to buy it from the company website directly.
6 months ago
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Osama ************
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Greg ***********
get a XIAOMI Dual SIM phone . . like the Xiaomi 11T Pro 8GB/256GB
6 months ago
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Roger *********
Xiaomi
6 months ago
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Brook ********
It’s not the phone, it’s the user.
6 months ago
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Lee-Ann *******
Need to make sure phone is unlocked to all network's when you purchased, when traveling, make sure either SIM 1 or 2 in settings is set up to work for data, messages and calls etc
6 months ago
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Nick ************
Never had a problem with Samsung dual sim phone. Not a fancy model either.
6 months ago
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Ian ********
Samsung 24
6 months ago
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Darren ******
I call the UK from my Thai SIM and use 005 then UK code and number , something like 5-8b a min
6 months ago
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Harris **********
I have a esim with my Thai carrier and a physical sim from my Australian carrier in my Samsung s23
6 months ago
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Bill *********
Is it possible that your oppo phone is locked to a carrier other than your sim ?
6 months ago
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มิเชล *********
Get an IPhone or if you need android get Samsung S series both are international phones and can be used anywhere
6 months ago
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Chris ******
I've got oppo phone double SIM no problems in any country I've travelled think it's maybe your network
6 months ago
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Phil ********
Was the Oppo phone bought in Thailand?

Was it bought from a network provider like AIS or DTAC?

If so it maybe locked to these networks.
6 months ago
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Christopher ***********
@Phil *******
 Great thinking Phil. If it was it would have been considerably cheaper than the unlocked version.
6 months ago
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Christopher ***********
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Jennifer ******
It's probably the settings. Go to a phone shop and ask.
6 months ago
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Ken *******
S21, s23 works us and thailand
6 months ago
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John *********
iPhone with USA sim and Thailand AIS e-sim works perfect anywhere anytime. I switch between SIM cards while in Thailand flawlessly.
6 months ago
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Jack ****************
ORIGINAL POSTER
@John ********
 your iPhone has 2 Sim slots?
6 months ago
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Deena **********
!4 Pro as well. Two esims
6 months ago
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John *********
@Jack ***************
 no sim slots. Apple 15 is all ESIM
6 months ago
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John ********
@Jack ***************
 most likely one physical sim and an esim
6 months ago
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Wayne *********
@Jack ***************
 he has esim does not need 2 sim slots can install up to 6 numbers an use any 2 at same time
6 months ago
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Wayne *********
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Chris *********
I have a Huawei bought in Thailand that works on T-Mobile Sims statewide. You couldn't buy one in USA, but it functions fine.
6 months ago
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Phil ******
@Jack ***************
 Samsung s24. Allows for an esim.
6 months ago
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Gary **********
I have a oppo still have it 4 years on. Never had a problem. In fact I'd say they are the best phone ..also used it in Thailand and UK with double SIM ..
6 months ago
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Harris **********
Samsung's S23 Ultra best phone ever
6 months ago
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Phil ********
@Harris *********
 Doesn't have Facetime 🤣
6 months ago
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Harris **********
@Phil *******
 You mean mesenger or wifi call, it has all the Ai features that Samsung just released 2 weeks ago that the S24 has as a bonus update 😅🤣😂
6 months ago
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Phil ********
@Harris *********
 Mai mee jaa 🤣
6 months ago
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Harris **********
@Phil *******
 I can get I'm sure
6 months ago
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Harris **********
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Ling *****
I bought a new Samsung A54 last year with dual sim. Both sim slots work in all the countries I've visited, like Thailand, Indonesia, Vietnam and Australia.
6 months ago
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Lynnette *******
So now you say your USA SIM doesn't work in USA.
6 months ago
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Mike ******
Samsung phones work in the US and Thailand and I would guess all other locations.
6 months ago
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Chris *****
Get a phone that supports e-sim. I think you can add 10 or so with iPhones
6 months ago
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Glenn *****
Did you enable Roaming? Phone and carriers settings
6 months ago
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Lynnette *******
@Glenn ****
 he says US sim doesn't work in USA. 🤷
6 months ago
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Glenn *****
@Lynnette ******
 ok
6 months ago
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Lynnette *******
@Glenn ****
 bit confusing.
6 months ago
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Lynnette *******
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Scott ***************
You need a dual Sim CDMA/GSM/ LTE phone Thailand Uses GSM and LTE, US uses all 3 depending on which carrier. I'd stick to Samsung or Apple phone.
6 months ago
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Martin *****
Samsung s24
6 months ago
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Aake **********
I have a Samsung s20 ultra 5g works perfekt in Europa and Thailand
6 months ago
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Lynnette *******
Surely it's the type of contract for that SIM that counts? I can't use my UK SIM in Thailand without huge cost so I don't use it and use Skype. Just load a few ££s on it.
6 months ago
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Jack ****************
ORIGINAL POSTER
@Lynnette ******
 my USA Sim doesn't work in the USA.
6 months ago
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Lynnette *******
@Jack ***************
 that's strange. My sims working my Oppo phone. Perhaps there's a fault on your SIM.
6 months ago
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Jack ****************
ORIGINAL POSTER
@Lynnette ******
 I mean maybe? But it worked on my previous phone. My theory is that some standard is similar, but not exact in a way that makes this phone not work on the networks correctly. It is also a wonky model of the phone that they didn't continue to make- maybe that is related. Dunno, I've only got the one data point.
6 months ago
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Christopher ***********
@Jack ***************
 As already advised, it’s one of two issues; 1) Incompatible frequency bands or 2) Locked to a Thai network.
6 months ago
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Christopher ***********
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Braulio *********
Apple
6 months ago
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Braulio *********
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