Unlocking iPhone 5 at the end of my 24 Month Contract?

Question

I'm sorry if this question has been asked before, but I've been a little thrown by the information provided by my network (eMobile Ireland)
My 24 month contract on my iPhone 5 comes to an end in the next couple of weeks, I contacted my network yesterday to ask about unlocking it so a family member can have the handset & changing my tariff etc.
They advised me I am now eligible for the device to be unlock from the network, took my IMEI and processed the request,
The email I've received this morning has confused me a little.... (I'll highlight my query)
"We have received your iPhone unlocking request and your phone will be remotely unlocked within the next 10 working days. In order to fully unlock the phone you will need to follow the below steps after 10 working days:
1. Place the SIM card of the new operator you wish to move to into the iPhone.
2. The iPhone will then 'Brick' (a security feature) and will require a connection to iTunes to perform a 'Customer Restore'.
3. iTunes will detect the IMEI of the device and search for updates (this normal and is performed every time the iPhone is connected to iTunes).
4. iTunes will detected the new SIM and that the 'Unlock Key' is available. It will then deploy the Unlock Key to the device.
5. From here, the iPhone (still connected to iTunes) will perform the standard un-brick process which includes:
i. Check for latest Software update
ii. Perform a customer restore (SYNC)
During this process, your iPhone will detect the SIM of a new network operator and iTunes will deploy the necessary 'Carrier Bundle' to the phone. This contains the correct settings for the new network operator, which also includes the operators' 'Network Lock'.
This means that your iPhone will then become locked to the new network.
Once the syncing is complete your phone is now ready for use with another network operator.
If you need to unlock your iPhone again you will need to contact the network operator the phone is now locked to. You can find this information by going to settings > General > About and beside 'Carrier' the network operator will be displayed.
I hope you find this information useful.
Kind Regards,
The  eMobile Team"
Whenever I've had a handset unlocked in the past, it didn't relock when I used a new sim from a different network, is this really what happens or just some misinformation?
If so is this the case if I use an existing sim card such as the one from work phone or a Pay As You Go sim card?
Any further info or personal experiences would be hugely appreciated.
Thank you in advance,
Bobby H.

Answer 1

I recently unlocked my iPhone 5s & it didn't quite follow the instructions provided by the network, all I had to do is insert the SIM from a different operator & connect to iTunes & all was fine; no congratulations message saying the phone was now unlocked nor any saying the SIM was invalid, it didn't lock to the new network.
To be sure I checked on Apple's site & it worked as they said rather than how my provider said.