How to unlock Alcatel One Touch 983 with SigmaKey/SigmaBox


You've got a new smartphone but it's locked by the carrier (SimLock)? Or maybe, you want to flash your device? Let's say it's not that big of a problem you might think of.

Here, at GsmServer you will find a solution for a number of cell phones, tablets, modems and other gadgets. We want to show you what we mean by the example.

Today we have a brand new but locked Alcatel One Touch 983 and really unique phone servicing tool SigmaBox, that gives you the ability to flash, unlock and repair MTK, Broadcom and Qualcomm-based mobile devices. The modern box that is unrivalled for its convenience, has a number of unique features, and has a great customer support.

So we have locked Alcatel One Touch 983 with Broadcom — BCM21552G CPU and SigmaBox servicing tool.

You may review the list of models supported by Sigma at the official website

If its your first time working with the box, firstly you have to perform the following steps: download the latest update of Sigma Software, Sigma Updater and SigmaBox Drivers, and phone drivers at the same website.

Install Sigma Software, Sigma Updater, then install drivers, and plug in SigmaBox to PC via USB cable.

Launch Software Updater and update your card (hidden inside the box; it's used to verify software authenticity).

In case you have any questions regarding the first launch of the box, you may visit official Sigma website for more manuals and how-to-s

The next step would be the launch of Sigma Software. At this point you need to select the platform that our Alcatel One Touch operates on (Platform-Broadcom). It's located at the upper left corner. Then choose CPU model (see the screenshot below).

Sigma Box - Choose CPU Model

Plug in powered OFF phone to SigmaBox via USB cable.

In the ports selection menu choose Broadcom USB to Serial (usually it is set by default).

Sigma Box - Ports Selection Menu

Now's the most interesting step, and thanks to Sigma, the easiest one – phone unlocking.

Please choose Direct Unlock option

Sigma Box - Phone Unlocking Menu

A couple of seconds... Just let Sigma do the job.

Sigma Box - Phone Unlocking Process

And we are getting the following message – "Unlocking Phone……Done".

Unplug Alcatel One Touch 983, take the battery out, put it back in and turn the phone ON again.

Now your cell phone is unlocked and you can use any sim card. Next time you will unlock cell phones, this procedure would be taking one minute of your time only, as everything is set up and ready to use.

Being the youngest phone flashing and mobile unlocking tool on the market, today SigmaBox is the best and the quickest solution to service the latest MTK, Broadcom and Qualcomm based phones.

We hope this information will be helpful for you!