Seems TCP traffic vs UDP is a lot slower due to backhaul and latency to the US. This is indicative on intl roaming in general - throttling then just makes it a bit worse.

Also noticed the FT app takes AGES to refresh ; have this same issue when on in flight WiFi in the US with the FT app

Worked fine in Vienna and Prague.

In Vienna, it prefers to roam on T-mobile. But my AT&T iPhone connected to the A1 network most of the time, where the signal was stronger and often LTE.

I didn't try to force my iPad mini 2 to connect to A1 because t mobile was fine for the most part.

I took a long train from vienna to prague. MOst of the time between bigger cities, there was no signal or just EDGE. I did force the iPad to use O2, which is supposedly better in coverage. Iphone stayed on O2 by itself.

Both Austria and the Czech Republic are suppose to have reasonable prepaid options, like $10-13 for 1 GB. But for my use, which was mostly Google Maps while I was out, I made do with roaming at throttled speeds.

If I spent at least a week at each location, I probably would have splurged.

Nicaragua
 

Spent a week or so in Managua, Nicaragua and my phone roamed onto Movistar (displayed MOVISTARNI) in HSPA+ automatically after I took it out of airplane mode. I got the usual welcome texts about roaming coverage, high speed data options, and calling rates.

Seemed to work well, but the data was slow. Speedtests averaged 0.12 Mbps down, 0.20 Mbps up, and 500 ping. I used WiFi at my hotel a lot, but used celldata when it was out, or I was away.

I got two incoming calls, I let 1 go to voicemail. The TMO visual voicemail app worked just fine later to listen to the message. SMS messages were delivered and sent without delay. My phone is a Nexus 5 running Lollipop.

Wiki has been updated.

Wish I had searched this thread before going to HK last week. Just noticed a comment about turning off LTE on your phone. Will have to remember to try that on our next trip abroad.

Wife and I both had a lot of problems staying connected to a network in HK on our iPhone 6s. We probably had no service 30% of the time and then lots of switching between China Mobile and SMC (SmarTone?).

Any recent examples of TM roaming in Egypt? Will be in Cairo for 3-4 days then cruising south (Aswan I believe). The TM map looks good, but it seems that if you're even a tiny bit off the covered area - not only will you lose 3G/2G or whatever, but you'll have zero service, period.

Also, the above Wiki shows 3 networks will work there. Any idea as to which is the best?

I'm back in France getting relatively reliable service from SFR 3G. On the train there were moments when I lost connection and it came back as SFR E (Edge?) but 3G is pretty stable in Paris very similar to the Tre quality in Italy.

Train coverage in both Germany and France isn't great; you may fallback to 2G/EDGE quite often

Hmm, I once had SFR prepaid and took the train from Cannes to Monaco, which is an hour.

Dropped in and out but mostly good 3G speed.

Just got back from Italy, Austria and Germany.

Italy was all over the place as to which carrier it would lock onto. Of course we stayed in an old monastery in Tuscany with foot-and-a-half thick stone walls, so data service was limited inside - unless I put the phone next to the window. I frequently would "drop" the data connection (just a voice connection), and had to force the iPhone off data and back on (turn data off, wait 30 seconds, then back on).

On the train going from Florence to Venice then on the night up to Munich (via Villach, Austria), had decent service (4-5 bars) using TIM - even in the tunnels - guessing that TIM is TrenItalia's preferred carrier...

Once in Germany, we took the train back down to Salzburg from Munich, and didn't have reliable coverage from any one provider (I have a blau.de SIM, T-Mo US SIM, and there were swaths where one had service and the other didn't). Trying to force to latch the T-Mo US phone onto O2 or E-Plus wasn't very successful. Being on a train, it wasn't a big issue. Salzburg had decent service on T-MO Austria (slow, but seemed faster than in Italy or Germany).

Can't complain - the Edge-level speeds work fine what I was doing on the phone (voice, text, Facebook and Maps). (I did have a TIM Welcome Internet SIM in Italy, and have a Blau.de SIM for Germany for my iPad for the serious surfing - like downloading some music/podcasts...).

J

In Italy, it's worth buying a prepaid SIM if you're staying at least a week because the network and the prices are very good.

Just landed in Hungary, and started receiving messages saying: Your Intl Data Roaming Charges in this bill cycle have reached $100. To turn Data off Dial #ROF# (#763#) SEND. And then received another one for $200. I logged into T-Mobile and don't see anything indicating extra charges. Only thing different than usual is I'm connected to T-Mobile's network. Chat is busy, and too tired to wait on hold with the phone. Anyone know what's going on?

Update: Looks like an error on T-Mobile's side according to this thread: https://support.t-mobile.com/thread/...art=0&tstart=0

Is Hungary on the list?

Yep, first thing I checked. Even if it wasn't, I connected to a Jordanian network while near the Dead Sea in Israel, and T-Mobile sent me a message about opting-in to data.

+1000.

My trips to Italy tend to be in the 7+ day range. Always shoot for a Vodafone SIM. Amazing service at very, very reasonable rates. Even if my iPhone w/ TM was working at 3G speed, I'd still get a prepaid SIM. (Also, I don't like TIM or 3.)

Currently leaving South Africa. Got Vodacom 3G service in Johannesburg and Capetown. Had to call back to the US a couple of times and it worked just fine. Was good for maps, Über and other apps, email worked fine, but complicated apps were a little slow.