Good tip that - and better the using 1470 - which although it works in the same way to release your number - it messes up the contact feature - so when someone rings you if you have the number stored with the 1470 it doesn't show the name. I have just tested using the *31# code and it does.
Indeed. Here is the background behind it:
Because 1470 and 141 are PSTN Fixed Line Codes.
*31# and #31# are GSM Codes. GSM is the Standard Operating Protocol set for Cellular Networks.
AIUI▸ it's a standard similar to the likes of 802.11n (Which is WiFi Wireless N Band)
It was originally developed and the standards set by the European Telecommunications Standards Institute or ETSI for short.
PSTN codes and GSM codes are for two completely different infrastructures and systems. Imagine trying to book a Flight through National Rail Enquires for example. The reason why someones contact won't show up on your phone with the 1470 or 141 prefix in the contact entry when they ring. Is because the number ringing is not: 147007000000000 but 07000000000 so the phone will show that as "I don't know who this is... Here's their number, do you know it from memory?"
Prefix the contact in your address book with the GSM Code and the handset will ignore it if for incoming calls as it knows the function for the * or # 31# prefix is for outbound calls only.
Just like #99# will instruct your handset to establish a Data Connection for Web Browsing. (That one is seldom used as the handsets and dongles do this automatically for you
)
The other GSM code which you may find really useful is *#06# which will give you your handsets IMEI number. If you're phone ever gets nicked, pass this to the Network Provider and they'll block the handset from being used for you immediately. (This can be reversed
AFAIK▸ if you retrieve your phone!) If you have insurance and have the handset replaced you'll need to pass the new handset's IMEI number to the insurance provider or your policy will become invalid
Another tip on the house.
*Note to the Mods - Worth shifting my two posts here to News and Assistance or Frequent Posters perhaps? *