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

# Mobile Plan

> Mobile carrier plan and what it's optimised for.

<Note>
  Last updated: 2026-06-14. Currently under review — usage is well below the plan allowance (see below).
</Note>

## Device

Primary phone: **Google Pixel 9 Pro XL** running **Android 16**. Specs current as of 2026-06-14.

<CardGroup cols={3}>
  <Card title="Model" icon="smartphone">
    Google Pixel 9 Pro XL.
  </Card>

  <Card title="OS" icon="android">
    Android 16.
  </Card>

  <Card title="Storage" icon="hard-drive">
    256 GB local. Rarely near the limit — most data lives in Google One cloud storage (see [Cloud Storage](/storage/cloud)).
  </Card>
</CardGroup>

## Plan

55GB plan with [amaysim](https://www.amaysim.com.au/), billed every 28 days.

| Field         | Value              |
| ------------- | ------------------ |
| Provider      | amaysim            |
| Plan          | 55GB               |
| Cost          | \$30 AUD / 28 days |
| Billing cycle | 28 days            |
| Annual cost   | \~\$391 AUD / year |
| Banked data   | \~2 TB             |

### Cost maths

The 28-day cycle means 13.04 billing periods a year, not 12:

| Calculation     | Value                       |
| --------------- | --------------------------- |
| Cycles per year | 365 ÷ 28 = 13.04            |
| Annual cost     | 13.04 × \$30 = **\$391.07** |
| Cost per day    | \$30 ÷ 28 = \$1.07          |

The 28-day cycle costs \~\$31/year more than a true monthly \$30 plan would (\$360), because it sneaks in an extra cycle each year.

### Typical usage

Measured per billing cycle:

| Cycle           | Usage         |
| --------------- | ------------- |
| 19 Feb – 18 Mar | 6.08 GB       |
| to 14 Apr       | 4.15 GB       |
| to 13 May       | 16.58 GB      |
| to 10 Jun       | 8.42 GB       |
| **Average**     | **\~8.81 GB** |

That's roughly **16% of the 55GB allowance**. Even the peak cycle (16.58 GB) only hit 30%. The unused \~46GB per cycle rolls over, which is how \~2TB has banked up. Effective cost of data actually used: \~\$3.41/GB.

## Why this plan

Works from home most of the time, so mobile data is light. The 55GB plan is heavily oversized for actual usage — the banked 2TB makes that plain.

Under review: a smaller, cheaper tier (or a true monthly plan) would cover real usage with room to spare and stop paying for headroom that never gets touched.

## Gotchas

The 28-day billing cycle is the main thing to watch — it's not monthly, so there are 13 charges a year, not 12. Worth factoring into any cost comparison against rivals that bill monthly.

Banked data has no real value if usage stays this low; it's a sign the plan is too big, not a perk being used.