I can confirm Bulgaria works. When I landed, it was taking forever so I did a manual scan and forced it onto MTEL and got LTE. After I had a minute, I set it back to auto and it swapped over to A1 BG at 2G for a few minutes, and then found what seems to be a good spot on Telenor BG (LTE).
Wiki has been updated.

Speeds on 1+ have been around .25 up and down - absolutely usable as long as you download google maps offline, and avoid video streaming. For email, facebook, and general web it works - slightly slow but nothing painful. This is my first trip outside of North America since moving to Tmobile - so far very satisfied.

I only see the $5 24-hr 512MB option, but I am on Simple Choice plan. Maybe the $20/1G will show up on Tmobile One plan?

I'm on a T-Mobile One plan and only see the $5, 24 hr 512MB option in my account. Very disappointing.

Not very "uncarrier"

Regards

That was my fear. I am wondering whether you can keep recharging the day pass though? I saw language for max of 2 passes per 24 hours, but the second pass would reset the 24 hour clock? It was confusing terminology.

I'm still gonna switch back to TMo from Verizon. I've found Verizon's international data speeds atrocious on my last few trips. I've traveled with a separate TMo phone and it outperformed VZ in nearly every destination including primary European cities. Plus VZ caps at 512MB for the $10/day option. So TMo comes out a bit cheaper to what I've been paying.

I'm going to Switzerland next week.

Their local SIMs provide "unlimited" data for 2 or 2.50 CHF per day.

If you have an unlocked device and you want way more data and speed than the free international roaming plan, you pretty much have to look at local SIMs.

If I'm going to a country for more than a couple of days, I usually get a local SIM for my iPad, while using the T-Mobile in my iPhone. Or I will tether the iPhone to the iPad for faster speeds.

You can often get enough data that you can use as an alternative to hotel wifi, which will always be slower than LTE and even 3G in many cases.

Updated the Wiki
 

Thanks to others who contribute to the wiki. Made the following changes

- Reflected NEW $5 per day High Speed Intl Roaming Passes that also include free inbound/outbound calling -

SHORTCUT TO ADD THIS: (from phone or desktop): https://my.t-mobile.com/odf/DataPass:ALL (add 24 Hour Global Pass)

- Edited the Canada/Mexico roaming to reflect 5GB high speed cap per month if not on T-Mobile One Plus International

- Cleaned up some of the links

Also take note that as of July 2018 more countries were added and we saw the return of Vietnam back to the inclusive data. Full list: https://support.t-mobile.com/docs/DOC-37944

NEW Countries added:
- Algeria
- Angola
- Bangladesh
- Benin
- Brunei Darussalaam
- Burkina Faso
- Burundi
- Cameroon
- Cape Verde
- Chad
- Congo
- Congo, Democratic Republic (DRC)
- Cote d'Ivoire (Ivory Coast)
- Fiji
- French Polynesia
- Gabon
- Gambia
- Gibraltar
- Greenland
- Guinea-Bissau
- Guyana
- Mongolia
- Morocco
- Mozambique
- Myanmar
- Nauru
- Niger
- Nigeria
- Oman
- Palestinian Territories
- Papua New Guinea
- Reunion
- Rwanda
- Samoa
- Senegal
- Seychelles
- Sierra Leone
- Tajikistan
- Tanzania
- Togo
- Tongo
- Tunisia
- Uzbekistan
- Vietnam
- Western Sahara
- Zimbabwe

Yes - Legacy passes gone
 

I would have preferred they kept the old passes but lots of other people complained of the charges.

So for the same $20 for 1GB you now get 2GB over 4 days. If you were good on using less data per day then you are hosed (I could go 5-6 days on the old pass) - Sorry they made this change. I did just update the wiki to reflect the change. The one POSITIVE is - for each day you have a $5 pass active, inbound and outbound calls are free. Meaning NO 25c (yes that went up from prior 20c a min) for any calls when a pass is active.

You can have ONE pass active and one in queue - though the interface right now is AWFUL. I did ask executive response at TMO if this will change and they did say at some point multi day purchasing will become easier. For now - you need to add a pass each day - YES THIS SUCKS. Suggest at the expire interval go to my.t-mobile.com on your device and add another pass for immediate activate vs queueing one up. I've had issues on queueing up passes and using the next one. Not tried to add a 2nd pass when used up all the 512MB of data and trying to add one more pass if the 24 hour period isn't over. TMO's systems haven't been very good for these kinds of things.

HINT: if you have Twitter - highly suggest authenticating with TMO Customer Care to send DM's to them to add passes. I do this instead of the website if I have limited time.

Also I did note a SIMPLER URL to add the daily pass:

https://my.t-mobile.com/odf/DataPass:ALL

are there any free hi speed trips given out?
 

Used to have t-mo, but currently have sprint. I've been surprised to be notified on some trips that I had FREE hi speed for the trip (but usually it was in a country that I was only in transit so never really used it) BUT on my latest trip to Japan I got this notice and it really gave me hi speed for the whole 2 weeks!
Is there anything like this at t-mo?

At time YES, like the World Cup in Russia. Considering SoftBank (Japanese company) owns a big chunk of Sprint right now wouldn't be a shocker.

At first I thought I would have preferred, but with the introduction of unlimited calling, I think that's a net positive for me as I'm coming over from Verizon and already paying $10/day.

The calling though, does that include calls between included countries as well? When I was last with TMo $.20/min was the rate if I called within country, back home, or to another included country. If this is now included in the daily pass, this is a no brainer for me.

Having just recently come back to using TMo, the interface to adding passes got much worse than a couple of years ago when you could bookmark a URL and quickly add the passes even on the 2G speeds. The last few times it took me many, many, many attempts to get it done from my phone and then ultimately had to go to my laptop to add it. It was so frustrating!

Thank you for both of these tips! Both will save me frustration and time! :) ^

I don't have a direct data point, but calling between included countries when in an included country has historically been 20¢/minute. It's a bit strange if you don't otherwise have an international calling plan on your line because calls from the US to these same places would be considerably more expensive. One corner case is Wi-Fi calling while in an international location is billed at 25¢/minute, even if you have a stateside international calling plan. Wi-Fi calling should be considered like the call originated from the US, regardless of location.

I have never purchased an international data plan from T-Mobile, but I would if the need arises. In my case, it's convenience over having to search for a local SIM card. There are some locations where it's easy, and SIM cards are freely available from vending machines in airports, etc. However, if I'm only in a location for a few days and/or there might be a language or other barriers preventing a non-local getting a SIM card (Japan comes to mind), the data pass is the clear no hassle option. I can't even remember the hours I've wasted trying to get a foreign SIM card to connect and then being frustrated when the plan I was sold didn't measure up to what the salesperson at the store had told me and ultimately being unable to use the SIM card the second I crossed the border into the next country.

If you're staying in a country a day or two, no it doesn't make sense to get a local SIM. Though with EU abolishing roaming surcharges when you cross borders between EU countries, it may make sense to get a SIM in the first country if you plan to visit several EU countries over a week or more.

It takes a little research to find out what the local SIM options are. There's are threads on FT and frequently updated info on the web. Then you find stores near where you'll be staying. I just consider it a part of planning and researching the trip.

I've never had problems with local SIMs not being as advertised. It can be a hassle in some stores, where you have to wait for a clerk who will sell you the SIM, activate it for you.

Now if you only need occasional email, web and Google Maps, while you're away from hotel wifi, then the free T-Mobile international data is enough. But I often find, regardless of the size of the hotel, that hotel wifi is unreliable. It's either off or congested or whatever. So if the mobile data isn't too expensive, I'd rather have that at least as a backup.

Of course some people can say, why do you want to even try to have the same kind of Internet speed and reliability as you would at home. Relax, you're on your vacation!

Well if that's how one approaches it, they probably wouldn't be in this thread or other threads about getting connected overseas.

Yes, I take the same considerations into account and will get a local SIM if I'm staying in a location where I can use it more than a few days or if there is a vending machine at the airport with a reasonable cost. I have had misunderstandings and dubious sales staff helping me in the past. There was one case I remember about five years ago months before T-Mobile introduced the included roaming where I bought a Vodafone SIM card at Frankfurt Airport. The person told me it was €1/day for 1 GB and 10 cents/min calling to many countries, including to the US. I was staying about a month, so I loaded the card with €40 thinking it would meet my data and calling needs. Taking this information at face value, I used the card indiscriminately until I lost the data connection 3 days into the trip. I checked and to my dismay had a €0 balance. I went to another Vodafone store where the staff there told me that whatever I had been told at Frankfurt was wrong.

The T-Mobile plan works for me internationally, even for some moderate social media use/picture sharing. I save the heavy usage activities for when I'm back at the hotel, but it's gotten me through my travels for the last five years without having to buy a local SIM card. It has had a few hiccups, but largely I've found the feature works as advertised and allows me to hit the ground running, not even having to stop at the airport phone store/vending machine along the way.

I wasn't notified, nor did I expect it (in fact anticipated buying passes a/r), but my T-Mobile line got 4G for the entire month of May while I island hopped in Greece. The only time I had slower speeds was when I went outside of Cosmote coverage areas (rare). Btw, all calls were 20 cents/min. - inside Greece, to other European countries, or to US; mobile or landline.
These features are baked into my unltd. data, text, and (North American) voice plan (Simple Choice).