You can use the AT&T Usage Calculator to estimate level of internet activity possible with each plan 

Yes. However 4K video will consume a lot of data.  You can use the  AT&T Usage Calculator to estimate level of internet activity possible with each plan 

For use in the Domestic Coverage Area only. Overage Charges & Data Speeds: There are no overage charges; if you exceed your high-speed data allowance, data speeds are reduced to a max of 512 Kbps.

 Available for eligible 4G LTE, 5G and 5G+ capable devices only.  AT&T BUSINESS DATA ADVANTAGE

 PLANS: Prices are for service only. All prices are billed monthly and are valid for use in the United States (Domestic Coverage Area) only. AT&T service is subject to AT&T network management policies. See att.com/broadbandinfo for details. Plans are limited to one line and require a compatible device, sold separately.

 DEVICES: For use only with eligible 4G LTE, 5G and/or 5G+ data-only devices (sold separately). Other data only devices and voice-capable devices (such as smartphones, feature (basic/messaging) phones and connected wearables) are not eligible. Line must be activated with the IMEI of the device that will be in use. Removing a SIM from the device that was activated and placing it in an ineligible device is prohibited and may lead to the line being disconnected. AT&T reserves the right to suspend or terminate service, place any noncomplying device on an appropriate plan, and/or add any other required element of a plan.

 DATA: Usage is calculated in full-kilobyte increments and rounded up to the next full-kilobyte increment. Additional or promotional data may not be available for use outside the Domestic Coverage Area.

 OVERAGE CHARGES AND DATA SPEEDS: No charge for overage. However, after all your high-speed data allotments are used, all data usage is slowed to a max of 512Kbps for the rest of the bill cycle. During that period, you will have basic data use for viewing a web page or checking email. Audio and video streaming, apps and services, picture and video messaging, as well as other data usage, including usage of data that is sponsored, will be impacted and may not be fully functional.

 RATE PLAN CHANGES: Rate Plan downgrades are prohibited during a billing cycle and will be subject to a $375 penalty charge. Rate Plan downgrades may be made effective on the first day of the next bill cycle.

 VIDEO STREAMING: Includes Stream Saver feature, which allows you to stream higher definition video in Standard Definition on compatible devices (unless video provider has opted out). Stream Saver will not recognize all video content. Ability to stream and video resolution may vary and be affected by other factors. To enjoy access to High Definition video on compatible devices and when available, you can turn Stream Saver off or back on at any time through your account management portal (att.com/myatt or att.com/premier, as applicable). Restrictions apply. Details at att.com/streamsaver.

 MISCELLANEOUS: Plans are not available for purchase in retail stores and select other locations. All offers, promotions, pricing, terms, restrictions & conditions subject to change & may be modified, discontinued or terminated at any time without notice. INTERNATIONAL ROAMING: International and domestic off-net (roaming) data usage may be at 2G speeds. Monthly plan prices do not apply to data usage while roaming outside the Domestic Coverage Area. Pay-per-use rates will apply when roaming outside the Domestic Coverage Area unless you add an international data package. For current pay-per-use rates, see att.com/intlppurates. For available international data packages, see att.com/global. Roaming requires a compatible device and may be at 2G speeds. 

 GENERAL WIRELESS SERVICE TERMS: Subject to applicable Business Agreement. If AT&T determines your use of the services violates any of the applicable terms or policies found in the Business Agreement, we may in our sole discretion suspend, modify, terminate, or restrict your service. Excessive Off-Net Usage: You get an off-net (roaming) usage allowance for each service. If you exceed the allowance, your service(s) may be restricted or terminated. Other restrictions apply and may result in service termination. Credit approval may be required. AT&T reserves the right to suspend or terminate service to your account, place any non-complying device on an appropriate plan, and/or add any other required element of a plan.