Software Version This code shows you software version, date of manufacture and hardware model number of your phone.

* # 3110 #
Show IMEI code If you need to know what's the IMEI code of your phone, simply press:

* # 06 #

you'll read it on display.
Show warranty information To get additional information from your phone you can use the so called "warranty codes", try typing:

*#92702689#    (= *#war0anty#).

You will be asked a 'warranty code:' type:

6232 (OK) : To display the Month and Year of Manufacture.
7332 (OK) : To display the date of the last repairment.
7832 (OK) : To display (if previously set) the date where the phone was purchased.
9268 (OK) : To display the Serial Number.
37832 (OK) : To set the Purchasing Date MMYY (Warning: You can only do this once)
87267 (OK) : To Confirm Transfer

Sim Clock information To check if the Sim-Clock can be stopped  type:

*#746025625#    (= *#sim0clock#)
Restore factory settings To restore factory settings (This does not include memory, language and  counters) type:

*#7780#
Find your lost security code Forgotten your security code?

First of all, find out your IMEI code and write down it.

Then download SID.exe and use it in conjunction with IMEI code you found.

Just remember if you got a a IMEI number that ends with something different from '0' you got to replace this with '0' when typing it into the sid.exe program to get the right code.
SPLock Mode If you want to inquire your phone about SPLock, you can use the following:

# pw + 1234567890 + [y] #

If you put your hands on your 10 digits SPLock code yet, then you can modify the status of the above results, typeing:

# pw + [mastercode] + [y] #

where:
[y] is 1 up to 4, and
any ten digits number seems working instead of "1234567890"
Unlock SP lock Here is a way to Unlock your phone which is Service Provider locked, without to know SPLock code !!!!
Give it a try:

First of all, PIN CODE MUST BE ON, then press:

C
<arrow down>
C and hold until it clears display
* and hold until start to blink
* and hold until start to blink
04*<your pin>*<your pin>*your pin>#

Each time you turn your phone OFF it resets the lock, so this need to be done each time you'll turn your phone ON :-(
Anyway it's better than nothing, isn't it?
Nokia Cellular Data Suite Want to use your laptop to send fax and data with your 3110's Nokia Phone ?

Here is what you need: the Nokia Cellular Data Suite ready to be downloaded!

There are three files, unzip them with "-d" option and then run setup.

P.S. If you need the cable to connect phone and PC, build your own! you'll find all needed info in the "Hardware" link.