> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bondio.co/llms.txt
> Use this file to discover all available pages before exploring further.

# How Plan Validity Works in V1 Subscriptions

> How plan validity periods start, end, and extend via top-ups in V1 subscriptions

The plan validity is the interval during which an end consumer can use the data internet service on an eSIM. The validity period of a plan starts upon subscription activation and finishes at the end of the number of days in the plan.

A subscription can be activated in the following ways:

1. **First usage** — Activation happens when the user connects to a cell tower inside the plan-supported region for the first time.
2. **Activate API call** — The client calls the `POST /v1/subscriptions/activate` API endpoint to activate.

<Note>
  For method 2, even though the subscription gets activated, the user may not be able to use the data internet if they are not in the plan coverage region.
</Note>

## How a top-up plan affects validity

The validity period of a subscription can be extended using a top-up plan whenever available. The top-up plan validity begins instantaneously at the time of the `POST /v1/subscription/:id/addons` API call.

Additionally, the top-up API call will only work if the eSIM already has an active plan.

**Example:**

If a subscription is created with a UK `1GB_7d` plan on 1st Jan, the plan will expire on 7th Jan.

If on 3rd Jan a top-up plan of `1GB_7d` is attached to that subscription, then the plan expiry date will become 10th Jan.