[OnePlus 5 Questions & Answers] Sass86oh:
No you don't need to do anything crazy to make it work on any GSM based device that's capable of receiving T-Mobile service. I'm currently using a OnePlus 5T on project fi after using the Nexus 6P which is the device I started my service with about 2 years ago. As long as you have already activated your service using one of the required phones which are supported by Google then you're good to go. You can even install the project fi app on any other Android device and it will tell you that this device is not supported for calls and text, however that isn't exactly true. Whichever device has your main Sim in it will be able to get calls and texts through the stock Android apps just fine.

A lot of people tell you that you have to use a Hangouts app in order to get SMS messages on unsupported devices but it's not true you can get calls and texts through the stock Android apps even with custom roms you just have to make sure that you go into the Hangouts app and you disable SMS messages for the account that's tied to your project fi service otherwise you'll only get your SMS messages through the Hangouts app. If you have Hangouts dialer installed then you have to make sure you also disable the option for incoming calls which can be found in the same section as the SMS option in the Hangouts settings for the email address that's used on your project fi account. Once you do that you'll be able to get calls and texts on the phone with the main sim card installed like you would in a device that's officially supported.

I should also mention that there are benefits to using the Hangouts app though. For instance let's say you have more than one device and you decide to order a couple data-only Sims, f you use the Hangouts app and you allow it to receive incoming calls and text messages for the email address tied your project fi account then what will happen is you'll be able to get phone calls and texts on any device that you use no matter what it is whether it's a tablet or a cell phone or an iPhone, just make sure you install Hangouts on each of those devices. You'll essentially be able to use whatever device you want but any phone that's using a data-only Sim will be using data in order to make phone calls and text no matter where you are so you got to keep that in mind. If you choose not to use the Hangouts app then the data Sims will only give you data coverage on your devices and you won't be able to use them as if they were like your normal cell phone. But if you choose to disable to Hangouts option then the device that has your normal SIM card in it won't have to operate over the data Network in order to use your calls and texts. It will even work on an iPhone and you'll be able to use I messages as well you won't be restricted to Hangouts app in order to get calls and texts but you can only do that with your main Sim on an iPhone. A lot of what Ive read on line is not true with regards to using unsupported devices.

If you choose to bypass the whole Hangouts feature and you only have one device and you follow what I said above then the only disadvantage you'll end up experiencing is that you won't be able to transition between the networks that project fi works on so your coverage will be limited to areas where there's T-Mobile coverage. In my specific area T-Mobile coverage is awesome and I've seen speeds of like 80 Mbps over lte.

Oh I should also add that if you happen to have any other Android devices with Hangouts installed you have to make sure that you disable SMS messages for your project fi account on all of your devices otherwise you'll still only get your SMS messages through Hangouts so if you're not getting your messages just make sure you check your other devices you sign out of there and then you're good to go.

---------- Post added at 06:32 PM ---------- Previous post was at 06:26 PM ----------

I don't know what you're talking about what project fi is awesome and they only charge $10 per gigabyte used of data up to 6 GB and then after that you'll have unlimited data access without being charged anymore so the max you will ever pay per month is $80 and that's only if you use 6gb of data. You'll also receive normal LTE coverage up to 15 GB in a month after which time your speed will be throttled but they offer an option two then continue paying$10 per gigabyte for normal LTE speeds should you need them I pay on average about $30 a month for cell phone coverage and I've had this for about 2 years now I was with T-Mobile for 12 years and they were an awesome carrier but you can't project fi. And then they also offer data only Sims up 10 per line which can be used in any GSM based device whether it's a hotspot iPad or Android tablet or some other phone that you might have an any day too used on any of the 10 devices you might have is all counted as if it was coming off your regular phone so you don't have to pay any crazy extra amount of money to have tethering. In terms of their pricing structure and what they offer there is not a cell phone company in the United States that has a better rate then project fi and then when you take into account the fact that even if you don't use one of their supported phones you'll essentially beginning T-Mobile service which has the best overall speeds of any other dating network in the country I mean it's a no-brainer here.