This has proven to be immensely useful while traveling. While in the U.S. I have a local SIM with unlimited voice&data, and can easily point my "native" number to SIP calls, and have Acrobits Softphone notify me when I have an incoming call to my native cell - without hanging in the background and eating battery. Purchasing g.729 codec might seem to be expensive but 100% worth it. One missing feature Id like to see is ability to set "route to SIP" in the app (e.g. for Megafon). Otherwise really appreciate the amount of work put in this truly useful app.
agnostic dog about Acrobits Softphone, v5.6.3