According to the antivirus report, this application doesn't contain viruses or any kind of malware. 3G Mobile Group is the official developer of the app which can be found in the Tools category. Users rated 3G Mobile Sign Ext 4.1 on Google Play.
The most recent release was on Oct 13, 2020 and this application was downloaded and set up by over 1K users. Download the latest .apk file of 3G Mobile Sign Ext 2.03 for free and take a look at users' reviews on Droid Informer. You will need 10 MB of free disk space to set up the app which is designed for Android 4.0 and higher.