Chuyên sửa iPhone lâu năm

Unlocking iPhone 3Gs–the Vietnamese way

Tuan Anh Do shows off an unlocked iPhone 3G at one of his cell phone repair shops in Hanoi.

(Credit: Dong Ngo/CBS Interactive)

Editor’s note: CNET editor and Crave contributor Dong Ngo is spending the next month in his homeland of Vietnam, and plans to file occasional dispatches chronicling his impressions of how technology has permeated the culture there. Click here for more of Dong’s stories from abroad.

HANOI, Vietnam–Every obstacle presents an opportunity. I saw this firsthand in Hanoi.

Tuan Anh’s shop on Nguyen Du street.

(Credit: Dong Ngo/CBS Interactive)

The obstacle in question: the iPhone 3G. Since its launch, it has proven a much tougher nut to crack than the original iPhone. Without a viable software-based unlock solution, the only way to make the phone work with any GSM carrier has been the use of a proxy SIM. Put this piece of very thin circuitboard in the iPhone 3G atop the carrier’s SIM, and you can make calls and text on a new network.

(I did experience some problems using the proxy SIM, including short battery life, instability, and, most seriously, incompatibility with iTunes.)

Unfortunately, the recently released 2.2 software update, for now, has made the iPhone 3G impossible to unlock–unless you happen to be in Hanoi. Here, I met a man who takes the job quite seriously and gets it done the hard way, literally.

His name is Tuan Anh Do, and he’s a 29-year-old businessman who owns five cell phone repair shops. A big part of his business is servicing the iPhone and iPhone 3G, and that often involves getting those devices unlocked at the hardware level.

One of his shops is on Nguyen Du street, a relatively small, quiet block in Hanoi. It’s located in a typically narrow four-story house, with one floor serving as a reception area, and another holding the accounting department. The top floor is the workshop, where the magic happens.

Here I witnessed a brand new iPhone 3G getting its hardware unlocked and was really impressed. This is how it happened.

First, a technician opened up the phone and stripped it to the motherboard. In his skillful hands, the device seemed much easier to dismantle than I expected.

The technician then extracted the baseband chip, the component that controls the connection between the phone and the mobile network, from the motherboard. (This is a painstaking task as the chip is strongly glued to the phone’s motherboard. A mistake during this process could brick the phone completely.)

A technician opens up a brand new iPhone 3G in one of Tuan Anh’s Hanoi shops.

(Credit: Dong Ngo/CBS Interactive)

The phone’s motherboard with the baseband chip at the bottom and marked with a red X for viewing’s sake.

(Credit: Dong Ngo/CBS Interactive)

Once the chip was extracted, it was Tuan Anh’s turn. He used a chip reader to read information into a file. He then used a Hex editor to remove the locking data from the file, and after that, the chip got reprogrammed with the newly altered file. Now it was no longer programmed to work with only a specific provider.

The chip then got reassembled into the motherboard, another painstaking process.

As a last step, the technician put the phone back together, and it looked like nothing had been done to it.

However, the phone is now unlocked and can be used with any carrier’s SIM. It can also be synced with iTunes and used with the original carrier and it can perform all other functions without any problem. But it’s not yet jailbroken, which Tuan Anh will do for free. He’ll even add lots of applications and utilities at no additional cost.

The baseband chip (which I marked with a red X to make it more visible) has been extracted from the motherboard.

(Credit: Dong Ngo/CBS Interactive)

Each such unlocking job takes about an hour to complete and costs 1.2 million dong (about $80), a small fortune over here. Tuan Anh said that so far, his business has unlocked hundreds of iPhone 3Gs and thousands of first-generation iPhones.

He also said that if an iPhone has been unlocked under the firmware version 2.1 or earlier, upgrading to version 2.2 will lock it again. This is because the 2.2 update is the first update that alters the baseband chip, a clear move by Apple to counter the software-based unlocking solution. In this case, Tuan Anh is willing to re-unlock it for a discount price of $50.

In case of mishaps, Tuan Anh said he would give clients a new phone. Considering that an iPhone 3G goes for somewhere between $800 and $1,000 in Hanoi, this is a bold statement, but so far, he has yet to brick a customer’s iPhone. He did, however, lose two iPhone 3Gs while mastering the unlocking process in the phone’s early days, a $2,800 investment at that time.

The chip gets glued back onto the motherboard.

(Credit: Dong Ngo/CBS Interactive)

The demand for the iPhone and iPhone 3G in Vietnam is amazing. Prior to my trip here, a few friends asked me to bring one for them from the States. Some even offered to pay me extra. I didn’t have time to take up any offers and obviously missed an opportunity to get my trip partially paid for. Still, I’ve seen a lot of people here with the iPhone. Tuan Anh said most iPhones 3G in Hanoi come from the States and Australia.

Tuan Anh’s shops also take care of repairing other kinds of cell phones from any vendors, especially those without a support office in Hanoi. And the shops are faring well. When I was at the Nguyen Du street business, all of his technicians were busy working on different phones, two of them iPhones. The workshop’s atmosphere was professional and quiet; I figure a job like this requires a lot of concentration.

The phone is now unlocked and working with a Vietnamese provider.

(Credit: Dong Ngo/CBS Interactive)

It’s striking to witness the amount of work these skillful workers get done, considering how modestly equipped the workshop is. The most sophisticated equipment I could see were a Pintex Oscilloscope and a couple of microscopes. The rest of the tools, such as solderers, tiny screwdrivers, tweezers, alcohol, and towels, are the sorts of things you could find at most hardware stores.

Tuan Anh now has about 30 employees, paying them $300 a month on average. That’s a very good salary considering the average income of a Hanoian is just around $100 a month.

Asked why he decided to get into this business, Tuan Anh, who holds bachelor’s degrees in history and journalism from Hanoi National University, traces it to a passion for computers and electronics, an interest he shares with many other Vietnamese.

He hopes that what he’s been doing with the iPhones wouldn’t be considered “illegal” in the States. Oddly enough, his dream is to become an Apple partner officially supporting the company’s products in Vietnam.

But illegal or not, Apple’s idiosyncratic policy has in a weird way given this bright man an opportunity to do more than just make a living. He’s proven that we really can be the master of our tools, not vice versa.

iPhone 3G đã được unlock ở Việt Nam –

Anh Đỗ Tuấn Anh, chủ cửa hàng TA Mobile tại Hà Nội, vừa mở khóa chiếc điện thoại thông minh này bằng phương pháp can thiệp vào IC trên bo mạch, khiến thiết bị hoạt động ổn định và linh động hơn cách ghép SIM từng làm trước đây.

“Ghép SIM không được gọi là unlock vì người ta dùng một miếng SIM mỏng để giả lập hay còn gọi là ‘đánh lừa’ iPhone, khiến hệ thống tưởng đang hoạt động với thẻ SIM của mạng AT&T”, Tuấn Anh giải thích. “Còn phương pháp mới của chúng tôi là biến đổi phần cứng để đưa mã khóa của mạng này về giá trị không khóa”.

Các chip trên bo mạch của iPhone 3G được can thiệp để loại bỏ “liên hệ” với mạng AT&T.
Nhân viên kỹ thuật ghép nối các thành phần trên máy.
Chiếc iPhone 3G trắng được lắp hoàn chỉnh và cài SIM.
Tính năng 3G được bật lên.
Truy cập bản đồ cần mạng Wi-Fi để cập nhật liên tục vị trí của người sử dụng.
iPhone 3G mở khóa đã được thử nghiệm trên các mạng GSM ở Việt Nam như Vinaphone, MobiFone, Viettel. Đỗ Tuấn Anh cho biết mạng MobiFone dùng tốt nhất với chiếc máy này.

Với phương pháp can thiệp phần cứng, chủ nhân iPhone 3G có thể thay SIM thoải mái. Tỷ lệ thành công và chạy ổn định cao hơn cách ghép SIM.

Cách ghép SIM dùng một miếng SIM mỏng đặt ốp vào SIM chính rồi đưa vào máy. Nhiệm vụ của miếng SIM mỏng là làm cho iPhone lầm tưởng đang hoạt động với SIM của mạng viễn thông thuê bao AT&T (Mỹ). Nhưng phương pháp này sẽ khiến chủ nhân phải gắn chặt với một SIM và máy đôi khi mất sóng, hay hao pin.

Các iPhone 3G được đưa vào Việt Nam có 2 loại. Một là iPhone có ký hợp đồng với một hãng viễn thông nước ngoài, vẫn phải đóng tiền thuê bao nhưng không gọi điện và nhắn tin được ở Việt Nam. Hai là iPhone “quốc tế” có thể dùng mạng trong nước nhưng số lượng máy phát hành rất ít.

Bài và ảnh: Thuỳ Hương