There is minimal API 8 required which is Android 2.2 and there is no maximum, so all future versions should be compatible, also I've tested on Android 4.2 emulator - it runs on it. Please provide more info and error messages (with screenshot please), so we can investigate it.
Yes, new 1.7 version is backward compatible and can connect to Dolphin 7.0.9 sites. However some features may be turned off, like Facebook login.
Also, can these new versions connect to a 7.0.9?
What is your Android OS version ?
Can these new apps also connect to 7.0.9 ?
Yes, new 1.7 version is backward compatible and can connect to Dolphin 7.0.9 sites. However some features may be turned off, like Facebook login.