This app was mentioned in 8 comments, with an average of 2.38 upvotes
honestly .. i went and got a cheap android "trac phone" on sale at my local grocery store for $9. It just uses wifi - no cellular data. I put Grandstream Wave on it and gave it to my 2 year old so she can "make phone calls".
It's crazy to me how much you can get for $9 lol.
Any "wifi sip phone" is gonna cost you a lot more, and probably not function any better (if not worse) IMO.
Right now I'm using Grandstream Wave. It's working with crypto and can both send and receive SMS over SIP.
I'm not 100% sure how it does at receiving calls when on the go, as I'm not sure I've had anyone call me when I wasn't on wifi.
I will second Grandstream Wave. I used CSIPsimple for a long time, but the application seems like it has been abandoned. GS Wave really does have tons of great features, including fantastic codec support (Opus), and very good video call quality.
I do have experience with the native android client, and the bottom line is that it is a bare bones SIP client, that is really it.
I have used CSipSimple since day 1, and i agree, regis seems to have lost interest in the project and it feels like its getting old and out of date.
I have switched to using Grandstream Wave.
It is very full featured: video calling, audio calling, SIP messaging (chat), BLF subscription, and conference capability. It is also nicely designed.
Hey u/ThisIsntChris - I am principal engineer at OnSIP.
Please let me know if you have any specific questions - either here or via pm.
As you have said we are a BYOD provider, and we have built out our own federated SIP platform - we are not a reseller of any proprietary solution, and we are highly SIP standards compliant. As such we support any standard SIP handset or softphone that is sip compliant. I personally use Grandstream Wave on my Nexus 6 for a softphone.
We have spent a great deal of effort building quality network, not just being a SIP provider. We have peering with virtually all top level carriers to minimize things like the number of hops you describe.
In general I would say sign up for a free account (no credit card required) try it out and see if it works for you, and as I said - please feel free to ask me any questions you may have!
edit: as far as being "open network wise" - we are literally an open network, specifically in that we federate SIP via DNS. This is a "big thing" for me - I've given several presentations on Federated SIP at OpenSIPS summits, and I also maintain my own Federated SIP github project. These concepts are core to our platform, and to our product offerings such as Hosted PBX.
I haven't really found one I like for desktop that I would recommend, okay maybe zoiper. For android however Granstream Wave is the best I have found so far.
https://play.google.com/store/apps/details?id=com.grandstream.wave
Voip.ms might not support SIP Simple (sms over SIP), I'd recommend trying Linphone and perhaps Grandstream Wave.
On another note, I would highly encourage you to get phones that support modern Android, there are quite a few cheap android phones out there with newer versions of Android, and old versions are quite insecure.
VOIP.ms + Grandstream Wave app.
Edit: Voip.ms also has instructions here: https://wiki.voip.ms/article/Grandstream_Wave