From my understanding, you cannot suppress that notification unless you completely disable notifications for the policy. We use AT&T for the business plans, everything is cached on the iPad app that was designed and then syncs when it is back on WiFi. Personally, I prefer Verizon and think that there service is worth the extra few dollars a month - we have had coverage issues with AT&T in the past. But, it all depends where you are located. Unlimited Data has become more affordable and I would recommend speaking to your carrier and checking with others for pricing and negotiate. Especially with business customers, they are very flexible from our experience.
Do you know what apps your users are overusing data on? Is it Safari, Netflix, Spotify, Etc? I would create configuration profiles with network rules to block this. Making sure that data is used for corporate purposes and WiFi is for your personal apps. For example, only allow Netflix, Spotify, Hulu, etc. when the user is on WiFi.If you don't want your users to be always restricted and have them have access to anything until they hit the data limit, I would scope the configuration profile to the violating devices of the data policy. If you wanted to get real nasty, use a whitelist and only whitelist corporate needed applications. I like to let the user know what we are doing and why, I would create a background and add it in that same profile and basically say "You have reached your data quota, until our plan rolls over, your device will be restricted to corporate needed apps only. Please contact the Technology Department with any questions." We do something similar with VPNs and Emulators as they are a problem with data security. Anytime that device updates and it falls into the policy criteria as violated, it gets locked down and the wallpaper gets set and an email is sent. Until it is deleted and updated inventory, it is not usable.
This all depends if your devices are supervised (and I hope DEP enrolled so it cannot be bypassed). Please let me know if you have any questions, I would be more than willing to answer or help in any way.
Jared
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