AT&T Unleashes Affordable Unlimited Data for “Connected Cars” – Chevy OnStar or ZTE Mobley


Late September 2017: We are awaiting official word from AT&T, however after multiple confirmed reports of folks trying to activate plans - it seems this plan may have been recently retired for the Mobley device. Existing customers should be grandfathered in, and it seems the plan is still available for OnStar Chevy customers.

Since 2015 most new Chevy, Buick, GMC, and Cadillac vehicles have come with "OnStar with 4G LTE" built in - adding an AT&T-powered Wi-Fi hotspot capability to the classic car-integrated OnStar security and navigation features.

Recent model Chevy owners now have access to an unlimited data plan for only $20 per month.

The basic idea is to keep your passengers entertained and online while underway.

But the rather limited and expensive data plans made this a worrisome prospect. A backseat full of kids each streaming their favorite show could blow through a data plan FAST after all!

To address this concern - yesterday (March 3rd, 2017) Chevy and AT&T began offering a new unlimited data plan for Chevy's with LTE OnStar built in.

Now you can use as much data as you want, for just $20/month!

But there are two big catches:

  • You need to have a nearly new Chevy.
  • The hotspot is only functional when the key is in the ignition, not all the time.

For RVers who are more concerned with data while stopped than while underway, this is a deal-killer.

But fortunately, there is an alternative - the ZTE Mobley.

With AT&T's Mobley Connected Car device installed, you can now get the same ridiculously cheap unlimited data plan - with no Chevy required.

And if you know what you are doing, you don't even need to keep a key in the ignition to stay connected - letting you stay online 24/7.

First Off - What is a Mobley Connected Car?!?

The ZTE Mobley can plug into the ODB-II port found on most vehicles manufactured since 1996, connecting them to AT&T's network and allowing up to 5 other devices to connect to the in-vehicle hotspot.

The Mobley is a small $99 device designed to plug into the OBD-II port found under the dash of most modern cars. When the key is in the ignition - the Mobley comes alive, creating a Wi-Fi hotspot to get 5 devices online while the vehicle is underway.

The Mobley isn't anything new - we wrote about it last May when it became the only "official" way to get unlimited hotspot data on AT&T.

But in the past to get an unlimited Mobley plan required also having an unlimited smartphone line with AT&T, and you also needed to be a DirecTV subscriber.

In the past few weeks AT&T has dropped both those requirements - and now AT&T has a promotional offer going until July 17th* for a "Connected Car Unlimited Data Plan (standalone)" that does not require DirecTV or any other AT&T plan at all to activate a Mobley.

The standalone plan initially launched at $40/mo - and now AT&T has dropped it to match the Chevy pricing.

Yep - just $20/mo, for all-you-can eat AT&T! (plus taxes & fees, which vary by location.)

But there are still some catches and complications....

  • July 17 Update: This date has come and gone, and so far - the plan is still avialable if you can find a device in stock!
  • Mid-September Update: We have gotten several reports that AT&T reps are telling folks that plan expired sometime in mid-September (we've heard everything from Sept 18 - 23).

Using Mobley in an RV - 24/7

This adapter will allow you to plug a Mobley into an AC power jack, no special under-dash OBD-II port required.

Most RVs lack an easily accessible OBD-II port - and even if you have one, who wants internet that only works while the engine is running?

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But - there is a way around this that enables the Mobley to run 24/7!

Instead of using the OBD-II port, you can instead get an adapter that will power the Mobley directly.

If you're comfortable, you can hack together an adapter on your own for a few bucks, or you can purchase one from someone who has done them. You can find AC, 12v and even USB powered ones on eBay & Amazon (just search 'Mobley adapter') - making it easy to keep a Mobley powered anywhere there's power available. We've even seen some folks hack together an external battery (video link) for the Mobley.

With the Mobley powered on continuously - you then need to change the default device settings to keep it from falling asleep every 2 hours. Once you do this, you have enabled 24/7 usage!

Never Sleep TIP: The ability to disabled the sleep mode was added to the Mobley via a firmware update. If you buy one with older firmware, you may need to wait a day or two before the Mobley downloads the update before you can disable sleep mode. You can make the adjustment in the dashboard (see the embedded video below for a tutorial on adjustments to make to the Mobley's setup.)

Other Mobley Catches

One other big catch with the Mobley is that it is a relatively limited and out of date hotspot relative to newer AT&T devices like the Netgear Unite Explore. In particular, the Mobley does not support LTE Advanced carrier aggregation, so it will be slower than other modern AT&T devices in the same locations.

The Mobley also lacks support for an official external antenna. A cellular booster is the only way to officially enhance the signal (the weBoost 4G-S cradle booster at $179 is a great entry level booster). And there are folks sharing physical hacks for wiring into the internal antenna. 

And you can only have five simultaneous Wi-Fi devices connected to the Mobley directly (the generic Canadian VM6200 allows 10), unless you add a Wi-Fi as WAN router to repeat the network.

And like most AT&T plans, the Mobley Unlimited plan is subject to "network management" slowdowns after 22GB of usage in a month.

The unlimited Connected Car plan is also for US use only, and will not work internationally at all.

But - people experimenting with the Mobley have been getting good speeds overall, and have not noticed much network management issues so far.

Our MIA members got tipped off about this plan two weeks ago, before the Mobley became widely sold out.

FAQ: Can You Transplant a Mobley SIM?

AT&T's Connected Car plan is intended specifically for the Mobley hardware, and AT&T can detect if the SIM card is moved into any other device. But since the plan is so new, it is unclear at the moment if they will do anything to block people from doing this.

We'll be monitoring forum threads to see if people are successful with transplants, particularly long term.

Getting The Connected Car Plan

If already you have a multi-line AT&T Unlimited Plus plan, you can add a mobile hotspot or Connected Car device (like the Mobley) onto the plan for $20/mo - it would essentially the same unlimited plan, but include Canada & Mexico coverage.  If you have this option, we recommend adding the Unite Explore mobile hotspot instead of the Mobley, it's a better all around device (antenna ports, carrier aggregation, support for more devices, no power adapter needed, etc.) At $199.99, it's not that much more expensive than buying the Mobley and getting a power adapter.

But if you do not have a multi-line Unlimited Plus plan, or any AT&T account at all - you can activate a Mobley through the Connected Devices department as a stand alone plan for just $20/month (plus taxes & fees).

March 30, 2017 Update: The Connected Car Stand-Alone Plan is available (when in stock) on AT&T's website. To order it:

Go to the Mobley Order Page from the AT&T Connected Devices section, and click 'Continue'.

- Choose either the 2-year contract or purchase the device for $99, accept or decline the the insurance.

- On the next screen - viola - the choice to pick the Unlimited plan.

Shipping Tip: Even though the check out screen will allow you to select a different shipping address than billing address (which is frequently the case for RVers on the road) - we highly recommend having the device shipped to your billing address. AT&T has a track record of suspending orders for 'identity verification' when shipped to a different address - requiring you to appear in an AT&T store with identification. Skip the hassle, and just ship to your billing address and have the package forwarded on by who ever is handling your mail.

(Note, do NOT let anyone talk you into the similar looking Audiovox device as a substitute, it is NOT a hotspot device and will not work on this plan!)


Due to the high demand of this plan, various online options are frequently sold out.  Here are some places to check for current stock on the Mobley:

  • Amazon
  • Best Buy Online (or you might find one in a store)
  • eBay
  • ZTE VM6200 is the Canadian model number for this device, and you may be able to find one unbranded to AT&T that you can activate.
  • Novatech - Has them in stock from time to time, usually priced just a bit more than retail.

Activating the Plan

If you ordered online: If you're able to obtain the device from AT&T's website, the plan should be automatically setup and activated upon arrival. You'll just need to setup your online account to manage the billing.

But if you obtain the device elsewhere (considered BYOD - Bring Your Own Device), you will then need to get the plan activated with AT&T. Also expect that if you have purchased a Mobley outside of AT&T you will need to obtain a SIM card from AT&T.

BYOP/Online:  The easiest is way is online, using AT&T's BYOP page - just enter in the IMEI if your Mobley or VM6200 device, and you should be presented with the $20/month Connected Car option. Your seller may be able to provide this information to you before shipping. You will also likely need to order a SIM card to be mailed to you, which is free and can be done during this process.

BYOD/In Person: (Note: as of mid-September, we have gotten several reports of the plan not being able to be activated by any AT&T representative - being told the plan was discontinued). If you choose to call AT&T or visit one of their stores instead, make sure you request the STAND-ALONE Connected Car plan for $20/month - not the Unlimited Plus plan. This is a postpaid plan, so thus you will need to pass AT&T's credit check (those who can't may be asked to put up a sizable deposit.) Most representatives at corporate AT&T stores or their central call number do not know about this plan. Many have reported back that they have had the best luck calling the Connected Car department directly at 866-595-1222, instead of the general AT&T line.   And others have been able to get representatives at Best Buy stores to set up the plan. Expect challenges and possibly having to go through multiple representatives until you find one familiar with the plan to get this setup.

May 2, 2017 - A new video tutorial to using and configuring the Mobley:

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Stream Saver: Slow Speeds with Video?

If you're noticing slower speeds (or lower video resolution than you'd like) when viewing content - AT&T may have turned on Stream Saver on your account. Read our ongoing member forum thread with instructions on how to test your plan for this, and how to get AT&T to turn it off:

Mobley Connected Car Plans & AT&T Stream Saver: Problem & Fix (MIA Exclusive)

For more info on the Mobley and this plan, check out:


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