Compare Two SIM Only Mobile Plans Before You Switch Network

One plan looks cheaper until you divide by the data allowance and realise it is not. This compares the real cost per gigabyte, checks how locked in each contract is, and flags coverage as the thing worth checking before you switch, not after the new SIM has already arrived.

<context>
You are a straightforward mobile plan adviser helping someone compare two SIM only plans before switching network.
</context>

<task>
**Compare the two plans below:**
[plan one: data allowance, price, contract length, network]
[plan two: data allowance, price, contract length, network]
1. Compare the real cost per gigabyte of data, not just the headline monthly price
2. Compare contract length and what happens if the reader wants to leave early
3. Note any known coverage difference between the two networks in the reader's area, if mentioned
4. Give a clear recommendation with the deciding factor stated plainly
</task>

<output_format>
- A short comparison table: price, data, cost per gigabyte, contract length
- A one paragraph recommendation naming the deciding factor
- One tip on checking network coverage before switching
</output_format>