No Need Do Not Call List

My phone numbers already in DO NOT CALL list for a long time, over 10 years, I think. But the spammers, scammers keep calling to my number. Especially with the upcoming general election, my phone keep ringing with strange numbers.

I used to not pick up any strange number. When I have a spare time, I googled these strange numbers to see who they are. If they are complained by other people, those numbers will be block.

On iPhone, I use Block Contact feature.

On Android phone, I add to my SPAM - DNA (Do Not Answer) contact that automatic put all calls go to voicemail.

And the best blocking feature I like most, coming from Google Voice / Hangout. Why?

Windows Phone 7

Take a day off to attend Microsoft Windows Phone 7 (WP7) Unleashed workshop. This is a hand on work shop, no marketing stuffs. Although I'm working on Android and gradually moving toward the Open Source and Linux, I love to keep up my current skills in Microsoft Windows technology.

Prior to the workshop, I needed to download and installed Windows Phone Developer Tools Beta. Honest to say, WP7 is much better than previous version Windows Mobile. The tool used to develop for Windows Phone is much easier than the tool used to develop Android. For Android, I must downloaded and installed Java SDK, Android SDK, Eclipse JSEE separately. Manually configured Android Virtual Device (AVD). However, for Windows Phone 7 Developer Tools, it just one click. Visual Studio 2010 Express for Windows Phone is much better than Eclipse.

There were four sessions for this work shop. When I worked on the first lab, Windows Phone Emulator could not load on virtual machine running Windows Vista. Thus, I must switched back to my Windows 7 partition. Moved on to lab number two, the Click event handler for the Search button did not work. Hmmm, I followed step by step as in lab document. I also had a chance to take a look on Windows Phone 7 handset. The LG Windows Phone 7 was bigger and thicker than my LG Android. The speakers provided useful information regarding to WP7.

I don't know WP7 is success in the future or not. At least right now, it has my attention. It's competitive with Android and iPhone.

Cell Phones in Vietnam

Nếu bạn dùng cell phones của Verizon, Alltel, US Cellular với kỷ thuật CDMA2000 qua các tần số (frequency) 850MHz hay 1900Mhz như những chiếc dưới đây, bạn có thể dùng tại Việt Nam. Để hòa mạng S-Phone, bạn cần cung cấp Electronic Serial Number (ESN) của máy muốn dùng và cách program NAM (xem ở đây).

If you're using the cell phone from Verizon, Alltel, or US Cellular that support the frequency 850Mhz, you can using it in Vietnam. In order to join the S-Phone network, you need to provide your handset's Electronic Serial Number (ESN) or a Mobile Equipment Indentifier (MEID) and manual to program NAM (Read more here).

Motorola RAZR V3m
Band / mode: CDMA 850 / CDMA 1900
Release Date: Q2 2006
Phonecoop.com Mobiledia.com
This handset worked in Vietnam using S-Phone network.

Samsung A670 Dual band.
Band / mode: CDMA 850/CDMA 1900
Release Date: Q2 2004 - Discontinued
Phonecoop.com Mobiledia.com CNet
This handset worked in Vietnam using S-Phone network.

LG V VX-9800
Band / mode: CDMA 850 / CDMA 1900
Release Date: Q3 2005 Discontinued
Phonecoop.com Mobiledia.com

Audiovox CDM-8900 (Verizon Wireless CDM 8910)
Band / mode: CDMA2000 1X 1900/800 / AMPS 800
Phonescoop.com Mobiledia.com CNet

Motorola V265
Band / mode: AMPS 850 CDMA 850 / CDMA 1900
Phonecoop.com Mobiledia.com

Theo trang "CDG: CDMA Worldwide" có ba công ty hiện đang xử dụng kỷ thuật CDMA ở Việt Nam: S-Fone (đầu số 095) và EVN Telecom (đầu số 096) và Hanoi Telecom. Thực ra, Hanoi Telecom (hay HT Mobile) đã chuyển từ kỷ thuật CDMA sang GSM (Ericsson to take over HT Mobile) từ năm 2009. S-Phone hoạt động trên tần số 800Mhz (như Verizon, Alltel). EVN Telecom hoạt động trên tần số 450MHz (theo CDG).

S-Phone Hỏi & Đáp: Máy di động mang từ nước ngoài
Các kênh phân phối của S-Phone
Mở mạng dùng mạng Sfone các máy xách tay

Các công ty điện thoại di động hàng đầu tại Việt Nam:

1. Viettel Mobile chiếm 41% thị trường với 5 đầu số: 097, 098, 0168, 0169, 0166
2. Mobifone chiếm 29% thị trường với 5 đầu số 090, 093, 0122, 0126, 0121
3. Vinaphone chiếm 24% thị trường có 4 đầu số: 091, 094, 0123 và 0125
4. S-Fone chiếm 5% thị trường có đầu số: 095

GSM:
Điện thoại di động dùng kỷ thuật GSM có 4 tần số: 850Mhz (USA), 900Mhz (Internationally), 1800Mhz (Internationally) và 1900Mhz (USA)

Trích từ Dual, Tri, or Quad Band GSM Phone?

Two frequencies are 'must have' frequencies - 900 and 1900 MHz. The other two bands are nice to also have, with 1800 MHz typically opening up more of foreign countries than 850 MHz would open up in the US.
Ideally the best solution is to get a quad-band phone with all four bands.

Nếu bạn dùng phone của AT&T hay T-Mobile có cả bốn băng tần (quad-band) 850, 900, 1800, 1900Mhz qua kỷ thuật GSM, bạn có thể dùng tại VN. Cứ việc mua SIM của Viettel, Mobilfone, hay Vinaphone ở Việt Nam gắn vào là alo, alo :)

Một số Quad-band world phones (850/900/1800/1900 MHz):

• Motorola V195: Prepaid from T-Mobile; unlocked from Amazon
  
• Motorola RAZR V3: Prepaid GoPhone® from AT&T. Prepaid Phone (T-Mobile) from: Amazon, Target, Wal-mart
• Motorola KRZR K1: Unlocked Cell Phone -- International Version with No Warranty (Cosmic Blue) from Amazon
• Samsung A237: GoPhone® from AT&T
• Samsung A437: GoPhone® from AT&T
• Samsung A737: Pre-paid GoPhone® from AT&T (Refurb)
• LG CP150: Pre-paid GoPhone® from AT&T
• LG CU515: AT&T
  
• Nokia 6085: GoPhone® from AT&T
• Sony Ericsson Z310a GoPhone® from AT&T

On the Net:

• CDG: CDMA2000 Subscribership Accelerating In Vietnam, Up 230% In 2007
• Số thuê bao CDMA2000 tại VN tăng 230%
• CDMA và GSM vẫn sẽ song hành tại Việt Nam
• Trào lưu bỏ CDMA theo GSM
• TheGioiDiDong.com
• DiDongCDMA.vn