I’m currently on the X2 and my warranty is up. I’m either going to stay with the X2 or move to the Mobi after it’s updated to be used with Android. Anyone on Mobi? What has your experience been?
I talked to Tandem and there’s a far-off plan for an extended infusion set only for Mobi.. looking into 2027. I am sort of surprised as the Mobi has a smaller reservoir volume.
Lauren
You can stay with the X2 for as long as long as it functions. I have 3. All function even to original that is 12 years old. I put them to sleep and can revive them if I need a temporary replacement. Just because the warranty is up doesn’t mean they can’t be used. 
I’m using the Omnipod but having issues with site placement so I figured the Islet pump might be better. My endo suggested the mobi and that seemed reasonable so I went to check the compat; since I’m on a 2ml pump (and it works) I don’t much care about the reservoir but I 100% to the max care about the compat.
So, for the compat I asked this:
For the reservoir you need the lifetime of the catheter; if it is big enough for that it is sufficient simply because it’s a royal PITA changing the catheter but filling the reservoir as an extra, is that so much a big deal? I’m an Omnipod user of course, so I have no choice but to do both at the same time.
I used the X2 for several years and now use Mobi. They are very similar.
Mobi advantages:
Because it’s so light, it can fall out of your pocket and it doesn’t tug at your skin.
It doesn’t create much of a bulge in your clothes and is very discrete.
The cartridge fill is a little more straightforward (though I didn’t really have a problem with the X2 procedure)
You can attach it to your body so you can use alternate infusion sites like arms though I personally don’t take advantage of that.
Disadvantage to Mobi
Overall, I like the Mobi and am happy with my decision.
I just recently got the mobi system. I’ve only ever used the omnipod 5 before… which has its own shortcomings.
I was kind of turned off by how the pump, cartridges, and infusion sets all arrived separately, separated by several weeks…. And the thought of having to charge the thing regularly… seems like a lot to keep track of for me given my job and the type of irregular hours I work in remote places….
so at this point I haven’t even actually set it up yet
If you put it on the charger when you shower, that’s all the charging it will need.
That’s making a big assumption about how often I shower;)
I think this might be my first post on the FU side, so be forwarded I type novellas… This popped up in today’s search for Android news.
I’ve been on Mobi since it first launched, coming up on 2 years. I really LOVE the pump… HATE the iPhone. (Seriously, how did they become so popular?) Thankfully, the pump is largely independent, something most people don’t understand when considering it, so I seldom carry the iPhone. You can bolus direct from the pump if you set up the completely customizable Quick Bolus feature. (It’s easier to learn on T:slim, though, with on screen feedback, so highly recommend trying it out before switching.) The pump communicates it’s status with pretty intuitive color-coded messages. Basically blue means it’s delivering extra insulin, green is good, yellow means there’s an alert, and red is danger, insulin stopped. The pattern of the flashing gives extra details if you care to learn. You can also quiet alarms for up to 30 minutes at a time with 3 quick button presses, until you can properly clear them on your phone. I’ve found most alerts, like BG or Control-IQ related ones, clear themselves in that time. Also, all your pump settings and Control-IQ live directly on the pump. The phone is just an interface, not the controller. That means you really only need to interact with the phone for less common tasks, like to start CGM sessions, change pump modes/profiles, load insulin, do extended boluses, or change pump settings.
I used my T:slim for 3.5 years out-of-warranty waiting on Mobi. I had some major pet peeves with it that made me not want to commit to another 4. Had no idea they would delay Mobi 4 years from it’s original announced 2020 date. Mostly I hated the micro-USB plug that made it feel archaic. Mine was so difficult to plug in, the way the metal lip was raised, instead of sunk in like a funnel. Always a wrestle. I always thought T:slim was small, but the weight was an issue for me. I also knew that they said back in 2019 at the R&D Day event, where they first announced the Mobi, T:slim X3, and Sigi pipeline trio, that the X2 didn’t have the processing power for the future algorithms they were working on. That was 7 years ago now, with a 4 year future commitment beyond that. 11 years of technological advancements since they admitted T:slim X2 was at the end of it’s capability. I honestly believe there will be software updates the X2 isn’t eligible for. That reason alone, plus knowing the X3 was planned to launch this year sometime (I’ve honestly lost faith in Tandem putting anything out on schedule anymore, though), I think it’s really irresponsible to buy an X2 at this point in time. If it were me, and I wanted the T:slim format, I would just use my out-of-warranty one until the X3 came out. And if it failed, then go back to MDI or explore other options.
All that said… Mobi addresses my every T:slim gripe. It’s half the size and 1/4 the weight. It’s completely unnoticeable. I’ve got my whole closet back, too. I never realized how much I modified the way I dressed just to support the weight of T:slim, so it wasn’t swinging around inside my clothes like a wrecking ball, until I didn’t have to do that anymore. The wireless charging is SO MUCH BETTER than micro-USB. It also means wireless software updates, which is a really big deal. No more scrambling to find a cable that works or banking my head on the keyboard while troubleshooting computer issues and why Tandem can’t connect to the pump. The phone just beams the software update right to the pump, easy peasy. The cartridge changes are ridiculously easier, too. T:slim being my first pump, I never really understood the complaints. Even trying Omnipod for a while, it didn’t seem all that different. But after Mobi, I get it. It would be really hard to go back to T:slim cartridges.
Things to consider: Yes, the volume is only 200 units. I was worried about that, being borderline. Thankfully, I use a lot less insulin with Mobi, so it’s never been concern. That’s been a frequent comment from other Mobi users, too. I personally believe the insulin is preserved better in the stout cartridge than in T:slim’s flimsy plastic bag (that’s what’s inside the cartridge), but who knows… I think I would feel differently about Mobi if I didn’t have a watch that displayed my BG. I check it A LOT. I checked it a lot on T: slim’s screen before that. I would be very frustrated having to locate my phone constantly for that info. Mobi’s battery is smaller. I used to only charge T:slim every 7-10 days, but I’m charging Mobi 3.5 days or so. It does charge really quick, though. I can go from 40% to 100% in less than 15 minutes. I honestly don’t know how long it takes because it’s always at 100 before I get back to it. Also, some users having major occlusion alarm issues. I don’t understand why. Even Tandem doesn’t seem to understand why, because it’s a small subset of pumps. I’ve never had an occlusion alarm except twice that were entirely my fault. Didn’t get the tubing snapped all the way in. It would be unfair to not mention it, though. Tandem has been replacing them if you ask, but they’re not volunteering replacements.
Things I don’t like about Mobi: Obviously, they’ve dropped the ball on Android. I’ve been one of Tandem’s biggest fan girls over the years, and I’m really disappointed with them now. I banked on a year at most of the iPhone, given that they were hoping for the end of 2024 when I got it, and they keep changing the promise to later and later and later… It was FDA approved last November, so it really should be imminent, fingers crossed. They also can’t launch Mobi outside the US without it, and that’s another thing that was supposed to happen first of the year. Second, I’m disappointed at the amount of things they locked behind Internet access. I’m sure it doesn’t matter to those who are using their primary phone, but my iPhone is almost never connected to the Internet. I also live rurally where Internet connectivity isn’t a guarantee. The Delivery Summary in T:slim’s settings menu doesn’t exist on Mobi. I used that a lot to check my average total daily dose and my basal vs bolus stats. Now you can only see that on the Source website if you’re uploading data. Sometimes I need Internet because the app wants you log into your Tandem account again, I guess for security. Even their phone number isn’t in the app, only a “contact us” link, whereas the tech support number was easily accessible from T:slim’s home screen (click on the upper right hand corner). Honestly, though, if those are my biggest gripes, I think we’re doing okay. No pump is perfect.
Also, you should know that the extended wear tubeless infusion set was FDA approved mid-2025, along with it’s tubed counterpart, SteadiSet. They’ve been prepping for launch ever since. I haven’t heard if the modified cartridge design was approved yet, though. We’ll know sure in a few weeks. Supposedly it’s a first quarter launch, but we’re still waiting on last quarter’s projects, so who knows. They did say in the last investor call that it’s their top priority, it’s a NOW project, not a 2027 project.
It actually needn’t be daily. Though if you’re really old fashioned and have your bath drawn for you once a week piping hot, I salute you, but you’ll have trouble with the charging…
the once weekly drawn bath isn’t just for me it’s for the whole family. I go first, because I’m the strongest;)
Thank you for that review. It gives me a lot of food for thought. I’m generally unhappy with the performance of the omnipod5, although I’m hopeful that their new algorithm will help with that. What I absolutely love about it is all I have to keep track of is having enough pods, and enough insulin….
With the other pumps what concerns me is keeping track of charging the pump, having enough insulin, having enough cartridges and infusion sets….
I live an unusual life all summer long where I’m jumping from ship to charter plane, or helicopter to ship all hours of the day and night and can’t even come close to establishing any sort of routine and that makes me very afraid of changing from the comfortable knowns… but I know I’d be stupid to not at least give the mobi a trial run before then. I’m just finding myself hesitant of the unknowns…. I was the same way before starting the omnipod
And welcome to FUD….. you might win the award for most informative first post!
Unless you only run in sleep mode, you can’t know whether you received an automatic bolus (and the size of that bolus) without looking at your phone.
I guess if you only bolus for food, it wouldn’t be a problem but if you give yourself correction boluses for highs you want to know if the system already gave you a bolus.
I was concerned about the IOB info at first, too, but it’s turned out to be a complete non-issue. I check my BG often, which means I know what what Control-IQ is doing in the background. If I’m over 180, I know Control-IQ gave a bolus. If you set up the quick bolus to count in grams of carbs, then IOB is taken into account. (usually, Tandem has stipulations when it doesn’t) Also, I’m just more reactive to insulin from Mobi than I was with T:slim. I don’t need to babysit and constantly correct. It does really well on it’s own and I am only bolusing for food.
Wow, thank you for your response! I’ve been reading on Reddit and some people are very dissatisfied with their occlusion errors. I hope this issue is resolved soon.. sounds like a hit or miss manufacturing problem. I talked to Tandem Sales this week and they said Mobi for Android will come in February and the extended set was just pushed to 2027. Hopefully she was wrong!
Hi, I enjoyed your posts on TUD, so glad to see you here.
Curious why you think that is the case? Control IQ algorytm is the same (I think) and infusion sets are the same, so not sure what the difference would be.
Thank you @Robyn_H and I like novellas. You’ve given me much to think about and that is what I wanted, trying not to sound creepy here, but this is what I wanted to know.
I have been on the Mobi for 8 months. Was on T-slim before that. Agree with everything @TTnyc says here!
Personally I throw the dog in. He heats the water up much more than I ever could so I feel justified.