Replicant

You should have provided logs of the radio buffer. However, I was able to reproduce the issue:

D/RILJ    (  695): [0189]> SETUP_DATA_CALL 5 0 free null null 0 IP
D/RIL     (  137): 2 RIL requests in the queue (1 pending, 1 handled, 0 unhandled)
D/RIL     (  137): Setting up data connection to APN: free with username/password: (null)/(null)
D/GSM     (  695): [GsmDCT] setupData: initing!
D/GSM     (  695): [GsmDCT] notifyOffApnOfAvailability type:dun
D/GSM     (  695): [GsmDCT] isDataPossible(dun): possible=true isDataAllowed=true apnTypePossible=true apnContextisEnabled=false apnContextState()=IDLE
D/GSM     (  695): [GsmDCT] get active apn string for type:dun
D/RIL     (  137): 1 RIL request in the queue (0 pending, 1 handled, 0 unhandled)
D/RILJ    (  695): [0189]< SETUP_DATA_CALL error: com.android.internal.telephony.CommandException: GENERIC_FAILURE
D/GSM     (  695): [GsmDC-1] DcActivatingState msg.what=EVENT_SETUP_DATA_CONNECTION_DONE
D/GSM     (  695): [GsmDC-1] onSetupConnectionCompleted failed, ar.exception=com.android.internal.telephony.CommandException: GENERIC_FAILURE response=null
D/GSM     (  695): [GsmDC-1] DcActivatingState onSetupConnectionCompleted result=ERR_GetLastErrorFromRil  SetupResult.mFailCause=NONE
D/RILJ    (  695): [0190]> LAST_DATA_CALL_FAIL_CAUSE
D/RIL     (  137): 2 RIL requests in the queue (1 pending, 1 handled, 0 unhandled)
D/RIL     (  137): 1 RIL request in the queue (0 pending, 1 handled, 0 unhandled)
D/RILJ    (  695): [0190]< LAST_DATA_CALL_FAIL_CAUSE {65535}

I'll look into it and let you posted.

That was fixed with: https://gitorious.org/replicant/external_libsamsung-ipc/commit/00c0e2f3a09731f5b0161ab528e56c906c3f28aa
The correction will be part of the next batch of Replicant image. In the meantime, you can build libsamsung-ril and push the binary to the device or ask me for a binary.

libsamsung-ril binary with the fix attached. To install, connect to the device with ADB with sufficient rights and run:

adb remount
adb push libsamsung-ril.so /system/lib/