MOST SIM - T-Mobile SIM Card for USA, Canada and Mexico, High Speed Data and Unlimited Calls/Texts - 21 Days

I bought a couple of these (for my wife and myself) for a trip to Mexico over Christmas 2020. I have an iPhone 7; my wife an iPhone SE (the original SE, not the 2020 version). We were due to fly from U.K. on 18-Dec, and received the phone number info email from MOSTSIM that morning, which was great to know the numbers before arriving in Mexico. Popped the SIMs in each phone before arriving in Mexico City, and switched on while waiting for baggage - could receive calls and texts but, unfortunately, no mobile data at that point. This wasn't the immediate crisis it could have been as our son and daughter-in-law were waiting in arrivals to pick us up and drive us to their home Tlaxcala, where we would spend the next 10 days. The problem with no mobile data was easily fixed - we had a (Vodafone) Profile on our phones. Once deleted mobile data worked just fine - the MOSTSIM instructions do actually cover possible issues with Profiles, so this was a 'user error' on my part! We used Telcel and it worked fine for us in Tlaxcala and (on way back) in Mexico City airport. My wife did experience one 'rogue' call and a couple of texts presumably intended for a previous owner of her SIM, but from other reviews we were expecting that might happen so just didn't answer the call / ignored the texts. I didn't get any. The only reason I rate as 4 stars and not 5 is the cost - these are quite a bit more expensive than other providers of T-Mobile SIMS for Mexico (and USA and Canada). That might be a premium for the good customer service that I read about in other reviews? I don't know - I didn't have to use them. That said, given that the SIMs worked for us (and that's the most important thing) I'd still use (the more expensive) MOSTSIM next time.

This worked well in Montreal. There were usually lots of networks / providers to choose from and I left it on automatic network selection. Occasionally there was no data, that was always when connected to Videotron, so I would have to switch manually to one of the others. LTE speed was always pretty good for general use (didn't run a speed test; used IPlayer radio, skype voice calls). On the last day at the airport I tried downloading some Netflix to use up the remaining allowance but it seemed to throttle it somehow (other stuff still worked; the Airport wifi also blocked / limited / throttled Netflix).Easy enough to do the registration step before leaving (but try to do it in advance because it takes a day or two). I used it in the other sim slot in my Android phone and that worked fine; I just enabled the sim slot on landing. Maybe took a few minutes for the data to start working but then fine all week. I had intended to look around for cheaper alternatives locally in Montreal but I bought 5Gb allowance and used less than 1Gb in 8 days so I never bothered.Did get some spam calls but never answered them as I didn't give out the number. Didn't even try calling home with it (tells you not to); I just used Skype to Phone which was fine over LTE if a bit laggy.Probably a bit expensive (~£30 for 10 days 5Gb data in Canada) compared to buying something locally but worth it for the convenience of having it right from landing. Not aware of receiving any further spam from Mostsim so far (2 weeks after buying).

The main choice in this area is either AT&T or T-Mobile, You can compare maps on their websites regarding coverage. city and town centres are on par with each other - AT&T has the edge in more rural areas, we drove up US Highway 1 - the coverage was limited but the scenery was a perfect counter, as soon as we arrived in a town things took a turn for the better for kids tethered to the main iPhone.It is important to note that information as regards how it fits in an overseas phone is scace with lots of information about backing up and default resets, I ignored all of that and placed the sim in the phone very briefly before I left and then turned it on as soon as we hit the black stuff in the US. The phone assumed the new number and easily sorted out that I had a new number - It synced my WhatsApp and sent my contacts information about the new number - everything worked well, remember to NOT call overseas numbers once you are in the states - WhatsApp calls are fine and also FaceTime if you have it. On returning home I switched the sims and my phone was back to my home number and everything settled week, Thank you Most Sim - you met a price point and performed well - Will recommend to others ;-)

Did exactly what it said on the tin! I travelled 1300 miles in 4 days - Boston, Niagara Falls, Toronto, Montreal, Vermont, New Hampshire, Boston and this sim worked perfectly! It never let me down once! Never had to change networks or anything between the US and Canada. Just popped it in the phone after I arrived (had already verifed that it worked back in the UK - make sure you do that) and was able to order my Uber instantly! The only time I wasn't able to get a signal was in the mountains in New Hampshire. Well I don't think that was down to the sim!So if you need it for Google Maps, Sending untold pictures of everything back to the UK, calls on Skype or WhatsApp, then I can only praise this! For just over £20 for 10 days - Was in the States for 8 days so bought the 10 day Sim just to cover two Saturdays.I very rarely have the time to leave feedback on items purchased, but this item definitely warranted it.I'm in Florida in November for 7-10 days! Will be back with a comment on coverage down there.