How to enable engineering/field test mode in blackberry

Blackberry has a very nice and interesting field test/Engineering mode.
While reading a blog I show that pressing ALT+CAP+H would display usefull  information about your mobile.
But you can enable the engineering mode from this screen using steps metioned in the blog:
http://www.zibri.org/2009/08/hidden-things-are-usually-best.html
Please make sure to follow steps very clearly. Read it twice!

UMTS Mobile Originated call flow sequence diagram (Mobile to Landline)

UMTS Handover event 2a, 2b, 2c, 2d, 2e, 2f explained

• Event 2a: Change of Best Frequency.
• Event 2b: The estimated quality of the currently used frequency is below a certain threshold and the estimated quality of a non-used frequency is above a certain threshold.
• Event 2c: The estimated quality of a non-used frequency is above a certain threshold.
• Event 2d: The estimated quality of the currently used frequency is below a certain threshold.
• Event 2e: The estimated quality of a non-used frequency is below a certain threshold.
• Event 2f: The estimated quality of the currently used frequency is above a certain threshold.

UMTS Call flow for Mobile to Mobile voice call

This call flow is mainly captured at the RNC.

What is IUFlex in UMTS

In the 3GPP Release 5 IUFlex is introduced. It provides an ability to connect RNC's to more than one MSC and/or SGSN. Major benefit would be load sharing between MSC's or SGSN's.

Features supported in 3GPP release 99, release 5, release 6, release 7, Release 8

I often forget what features are added or enhanced in the various 3GPP releases. Here is the list of supported features in the each of the 3GPP release which covers most of part of it.

Release '99

·        Bearer services

·        64 kbit/s circuit switch

·        384 kbit/s packet switched

·        Location services

·        Call services: compatible with Global System for Mobile Communications (GSM), based on Universal Subscriber Identity Module (USIM)

Release 4

·        Edge radio

·        Multimedia messaging

·        MExE (Mobile Execution Environment)

·        Improved location services

·        IP Multimedia Services (IMS)

 Release 5

·        IP Multimedia Subsystem (IMS)

·        IPv6, IP transport in UTRAN

·        Improvements in GERAN, MExE, etc.

·        HSDPA

 Release 6

·        WLAN integration

·        Multimedia broadcast and multicast

·        Improvements in IMS

·        HSUPA

·        Fractional DPCH

 Release 7

·        Enhanced L2

·        64 QAM , MIMO

·        Voice over HSPA

·        CPC - continuous packet connectivity

·        FRLC - Flexible RLC

 Release 8

·        DC-HSPA

·        HSUPA 16QAM

T3312 Periodic Routing Area Update Timer

Periodic RA update timer or  Periodic Routing Area Update Timer is T3312. T3312 is used to send RAU message periodically. Value of this timer is set based on the value received in the ATTACH ACCEPT and/or ROUTING AREA UPDATE ACCEPT message.

Normally, values are sent in the  Decihours. 1 Decihours =  6 mins.