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Iphone's do NOT support WIFI tethering (as of a few years ago) I'm pretty sure they still don't without jail breaking the phone. Tesla Vr. 5 firmware looks to only support WIFI tether.
As of a few years ago, neither iPhones or Android phones even existed. Your information is sorely out of date. The last 3 versions of the iPhone support Wifi tethering.
It depends on your definition of "a few years" I suppose. The iPhone came out over 6 years ago now.
Rather than buying a hotspot, I prefer to buy a small tablet with cellular connectivity (say, the new Nexus 7) and then tether to that. You get a great deal more functionality for your dollar, and the monthly charges are cheaper: I'm on Verizon's share-everything plan, and a hotspot costs me $20/month while a tablet costs me $10/month. The tablet pays for itself very quickly compared to the hotspot.
So, for example, if you listen to 30 minutes of slacker a day, you will burn through at least 250 MB a month. Adjust that based on you personal usage and keep it in mind when choosing a data plan.
Some information (and questions) about Slacker to help make a decision. Slacker delivers two different kind of streams depending on the client implementation. Either 128Kb MP3 or 40Kb AAC. Phone apps supposedly use 40Kb AAC so I'll go with that as the Tesla version. If it's MP3, triple the data usage. Does anyone know for certain?
Anyway, based on that, listening to 1 hour of slacker a day will use, at minimum, 540 MB of data in a 30 day month. If you frequently skip ahead in the middle of songs, you will consume more data since the pre-buffered song bits will be not be used (delivered but unplayed, counts against your data usage). It's not clear how much slacker buffers (though, they clearly don't buffer enough at times) but when there was a server error on slacker's side, it appeared that an entire song was buffered. Also, there is some delivery overhead but I'm not sure how slacker does their streaming and error handling.
So, for example, if you listen to 30 minutes of slacker a day, you will burn through at least 250 MB a month. Adjust that based on you personal usage and keep it in mind when choosing a data plan.
This sounds like a solid estimate based on your math. And with map tile caching also enabled in 5.0, the map should use little to no data long-term. (I'm assuming/hoping it will do periodic tile updates overnight while connected to wi-fi).
I would be interested to know how well tile caching is working. It seems like every time I leave my garage and switch over from wifi to 3g, there is a significant amount of time where I have no map at all (save for 3 or 4 tiles). It's an odd behavior that seems to be related to how far away from the house I can go with a weak wifi signal before 3g switchover. Slacker also will not play for the few blocks that I drive after leaving my garage. Kind of annoying.
I have unlimited data on ATT with an iPhone. At one time ATT said you could not tether with the unlimited data plan. Is that still true? Or has it changed, based on comment #44, above?
Throttling begins at 3GB; ATT did that to me once. I know you can jailbreak the iPhone to enable tethering, but at one time ATT could detect the tethering by examining the data stream. Is that still the case, or has the jail break tethering programs been revised to simulate the data stream of the phone?
Not sure about this... in my initial testing monitoring usage while tethered on my husband's phone, I observed a 3MB download per song. I need to try this again to confirm data throughput, but from what I saw and assuming a 3 minute song length, 30 minutes of slacker a day (10 songs per day) for 30 days (300 songs) would add up to 900 MB per month (and yes, I do a lot of skipping to the next song - that's not even factored in). I will have to give this a try with the lower quality slacker setting.
What was slacker running on? The MS? Do you have 5.0? That data rate implies MP3 at 128K rather than AAC. A 3 minute song is 2.8MB with 128K MP3. It would be a shame if the MS slacker implementation used MP3.
I have unlimited data on ATT with an iPhone. At one time ATT said you could not tether with the unlimited data plan. Is that still true? Or has it changed, based on comment #44, above?
Throttling begins at 3GB; ATT did that to me once. I know you can jailbreak the iPhone to enable tethering, but at one time ATT could detect the tethering by examining the data stream. Is that still the case, or has the jail break tethering programs been revised to simulate the data stream of the phone?
Yes, 5.0 installed on my MS. I just re-verified ~3MB per song (3:00+) at Best quality setting. Dropping to Medium quality setting drops it down to just over 1MB (for a 3:00+ minute song). In my 15 or so minutes streaming songs (and skipping to the next song) I used almost 41MB of data (again, both at Best and Medium quality settings, but mostly at Best).
I hope that some find this helpful. I have been struggling to figure out what my best option will be when the connectivity plans are revealed. I currently have an iPhone 4 on AT&T. I am looking to switch to TMobile so that I can at least save a little on my monthly bill, but the possible addition of tethering or another mifi type of device (and the amount of data that I will require for all of my devices including the MS) has my head spinning trying to figure out what my best option will be.
Does anyone who have 5.0 know if you can use the Model S itself as a hotspot? In other words, can I tether my wifi-only device to the Model S to be able to allow passengers to surf on their tablets?