無聊日誌

Using GPRS in iPhone can’t take incoming call depends on network

11 Mar 2009 4 Comments

by 無聊達人 in Apple, Hong Kong, iPhone Tags: Apple, GPRS, Hong Kong, iPhone, Problem

Well… It’s quite upset I always got complaints that I didn’t pick up phone call~~~
Now I found the reason…

You can check by dialing a secret code: *3001#12345#* and go into a Field Test App
GSM Cell Environment -> GPRS Information -> Network Operation Mode

I’m using Peoples, at least from home I’m checking now, the network belongs to GPRS NOM2 (002)!! Damn!

A GPRS network 130 can be designed to operate in three network operation modes (NOM1, NOM2 and NOM3). A network operation modes of a GPRS network is indicated by a parameter in system information messages transmitted within a cell. The system information messages dictates a MS where to listen for paging messages and how signal towards the network. The network operation mode represents the capabilities of the GPRS network. In a NOM1 network, a MS can receive pages from a circuit switched domain (voice call) when engaged in a data call. The MS can suspend the data call or take both simultaneously, depending on the ability of the MS, In a NOM2 network, a MS may not received pages from a circuit switched domain when engaged in a data call, since the MS is receiving data and is not listening to a paging channel In a NOM3 network, a MS can monitor pages for a circuit switched network while received data and vise versa.

iPhones, in some situations, can’t take incoming calls while on EDGE | iPhone Atlas – CNET Reviews