iPhone App?

[ferdowsi]

Has anyone tried or liked any SIP application for the iPhone? I found one called, 'SipPhone on iPhone' v-1.1.11, released April 22nd.

[ptrowski]

I tried Fring, it seemed to work well via wifi. I jailbroke my phone and used voipover3g to get it to call on the 3g network and while it technically worked, the quality was poor.

[Xponder1]

I tried Fring, it seemed to work well via wifi. I jailbroke my phone and used voipover3g to get it to call on the 3g network and while it technically worked, the quality was poor.

3G could get expensive really quick.

[redshift]

Tried Skype over 3G and it only used about 1 meg/min, so with a decent data plan VOIP over 3G wouldn't be too expensive.

[Aviator3]

I've used a couple of SIP clients on the iPhone, iSIP (formerly SipPhone) and Siphon, available via Cydia for jailbroken iPhones. I also use 3GUnrestrictor, so I can do VoiP over the 3G network. With the iPhone, I have an unlimited data plan, so I don't worry about the minutes, but I'm usually on wi-fi when I use it anyway. On 3G, quality is inconsistent, and varies from time to time, and place to place. Usually, I'll do a bandwidth check first to ensure that I have adequate bandwith before using the #G network for VoIP.

Fring was the first VoIP client I tried on the iPhone. Although it worked well (I used it on a trip to France to call back home) it has one major drawback. No access to the keypad in a call, so you can't access voicemail. Also, like Siphon, you can only configure for a single SIP account. Since I have several SIP accounts, iSIP is ideal for my needs.

[gatorrobin]

I've used Fring on Windows Mobile on my Treo Pro (Sprint) and calls sound pretty good, a bit hollow but definitely usable.

[mdntblu]

Fring works best for iPhone. It works with SIP on Voipo and Skype and Cellular.
Works on WiFi and 3G.

[VOIPoJustin]

Acrobit's Version (generically named 'Softphone') seems pretty well made for the iPhone.

[holmes4]

I have Siphon and it seems to work ok for me - haven't done much with it yet. And it's free.