Merge pull request #1723 from segmentio/twilio-developer-plan

adding new page under usage-and-billing outlining the new TDO

Author: rachlanders

src/guides/usage-and-billing/twilio-developer-plan.md

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+---
+title: Twilio Developer Plan
+hidden: true
+---
+
+
+The Twilio Developer Plan allows you to collect and process your data at scale, consolidating your data from up to 3 sources into a single warehouse for complex querying.
+
+## How is this offer different from Segment’s Free Plan?
+
+The Twilio Developer Plan allows for 10,000 Monthly Tracked Users (MTUs), while Segment’s Free Plan limits MTUs to 1,000.
+
+The Twilio Developer Plan is limited to 1 warehouse destination, while all other Segment plans also allow you to send data in real time to more than 300 destinations (all the analytics, marketing, advertising, and A/B testing tools you already use).
+
+|                              | Twilio Developer Plan | Segment Free Plan          |
+| ---------------------------- | --------------------- | -------------------------- |
+| Monthly Tracked Users (MTUs) | 10,000                | 1,000                      |
+| Destinations                 | 1 warehouse           | More than 300 destinations, including the analytics, marketing, advertising, and A/B testing tools you already use |
+
+
+Need more destinations or more MTUs? Upgrade to the [Team Plan](https://segment.com/pricing) for unlimited destinations and scaled MTU pricing.
+
+## How do I qualify for the Twilio Developer Plan?
+
+You must have an active Twilio account to sign up for the Twilio Developer Plan. Active Twilio users can sign up for the Twilio Developer Plan [here](https://www.segment.com/twilio-developer-plan).
+
+## What is a data source?
+
+In Segment, you create a source for each website, app, or cloud-based tool that you need to collect data from.
+
+For more information about data sources, see the [Sources Overview](/docs/connections/sources/).
+
+
+## Warehouse Destinations
+
+A warehouse is a central repository of data collected from one or more sources. This is what commonly comes to mind when you think about a relational database: structured data that fits into rows and columns. Some examples of data warehouse that are available on Segment are [PostgresSQL](/docs/connections/storage/catalog/postgres/), [Snowflake](/docs/connections/storage/catalog/snowflake/), [BigQuery](/docs/connections/storage/catalog/bigquery/), and [Redshift](/docs/connections/storage/catalog/redshift/).
+
+For more information about warehouses, see the [Data Storage Overview](/docs/connections/storage/).
+
+
+## How are Monthly Tracked Users (MTUs) calculated?
+
+Segment counts the number of **unique** `userId` values, and then adds the number of **unique** `anonymousId` values that were not associated with a `userId` during the billing period. Segment counts these IDs across all calls made from all sources in your workspace, over a billing month. Segment counts each user once per month, even if they perform more than one action or are active across more than one source.
+
+For more information about Monthly Tracked Users, see [What is an MTU?](/docs/guides/usage-and-billing/mtus-and-throughput/#what-is-an-mtu).
+
+
+## Common Questions
+
+### What happens if I exceed the 10,000 MTU limit?
+If you exceed the 10,000 MTU limit once in a 6-month period, Segment locks access to your account, but data still flows through Segment. To unlock your account, you can choose from these options:
+
+- **Option 1**: Wait for a full billing cycle (1 month) to go by without any overages. Segment unlocks your account if the MTU numbers reduce on their own.
+- **Option 2**: Upgrade to the [Team plan](https://segment.com/pricing/). This starts a 2-week free trial that gives you 14 days to fix your implementation to decrease the traffic.
+- **Option 3:** Upgrade to a [Business plan](https://segment.com/pricing/). Business plans are custom built for customers and typically have higher MTU limits than Team plans. [Click here](https://segment.com/demo) to schedule time with a Segment representative to see if a Business plan is a good fit for you.
+
+If you exceed the 10,000 MTU limit twice in a 6-month period, Segment locks access to your account and also stops sending and receiving data. You can unlock your account by following option 2 or 3 above to upgrade your plan.
+
+### How do I get more out of Segment?
+
+Segment helps you simplify data collection, personalize user interactions, protect data integrity, and respect user privacy. Explore the [Destinations Catalog](/docs/connections/destinations/catalog/) to see all the tools you can send data to once you get data into Segment.
+
+On Business plans, Segment also offers two add-on products called [Protocols](/docs/protocols/) and [Personas](/docs/personas/).
+
+- **Protocols** helps you automate and scale the [data quality best practices](/docs/protocols/tracking-plan/best-practices/) to improve data quality and trust across your company.
+- **Personas** is a powerful personalization platform that enables you to create unified customer profiles in Segment, to build and enrich audiences, and to activate audiences across marketing tools.