SnoopSnitch might be a bit more popular than Zoiper. We know about 2 links to it since March 2021 and only 2 links to Zoiper. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If you are looking to save money voip.ms + zoiper.com + data only SIM $15-30/m. Source: over 1 year ago
I've been using Zoiper. I used to use Linphone but ran into some issues. Zoiper has a good feature set, and desktop clients as well, so I picked up a license for a reasonable price. Source: about 2 years ago
You could try SnoopSnitch, although I'm not sure how accurate it is. Source: about 1 year ago
SnoopSnitch (version 2.0.12-nbc): Check mobile network security. Source: about 2 years ago
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Android IMSI-Catcher Detector - Detect attacks of fake base stations such as IMSI-Catcher and StingRay on your GSM/UMTS network.
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
Ostorlab - Ostorlab scans your web or mobile application and provides results showing threats and privacy issues.
Sipdroid - Free and open-source SIP/VoIP Client
OpenCellID - OpenCelliD is the largest Open Database of Cell Towers & their locations. You can geolocate IoT & Mobile devices without GPS, explore Mobile Operator coverage and more!