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I think there is only one error where it is certain that sending the message again will result in the same error, namely "Invalid sms number". This error is generated when the destination number is not a valid phone number. Other errors might me permanent or temporary but there is no way to be certain.

One of the reasons for this is that the error reporting of 3G/GSM modems is not very well defined, the same error message might be used for different causes without much relation to the actual error text.

Regards, Henk

For the most common errors with status code 300 it is not possible to be sure what the cause of the problem is and to know if the error is permanent. For instance the following common GSM modem errors:
unknown error
MM establishment failure
lower layer failure(for SMS)
can mean that the network is down, that there is too much interference, that the (prepaid) SIM card does not have any credits left or that the SMS operator does not accept the destination.

There are a lot of other possible errors, I have put a list below but these are not even all the possible error messages.

*Errors generated by Diafaan SMS Server
Invalid sms number: xxx
No gateway available

*Errors generated by the GSM modem
phone failure
no connection to phone
phone-adaptor link reserved
operation not allowed
operation not supported
PH-SIM PIN required
SIM not inserted
SIM PIN required
SIM PUK required
SIM failure
SIM busy
SIM wrong
incorrect password
SIM PIN2 required
SIM PUK2 required
memory full
invalid index
not found
memory failure
text string too long
invalid characters in text string
dial string too long
invalid characters in dial string
no network service
network not allowed, emergency cvalls only
network personalisation PIN required (network lock)
MM establishment failure
lower layer failure(for SMS)
CP error
please wait, init or command processing in progress

unassigned (unallocated) number
operator determined barring
call barred
network failure
short message transfer rejected
congestion
destination out of service
unidentified subscriber
facility rejected
unknown subscriber
network out of order
temporary failure
congestion
resources unavailable, unspecified
requested facility not subscribed
requested facility not implemented
invalid short message transfer reference value
invalid message, unspecified
invalid mandatory information
message type non-existent or not implemented
message not compatible with short message protocol state
information element non-existent or not implemented
protocol error, unspecified
interworking, unspecified

telematic interworking not supported
short message Type 0 not supported
cannot replace short message
unspecified TP-PID error
data coding scheme (alphabet) not supported
message class not supported
unspecified TP-DCS error
command cannot be actioned
command unsupported
unspecified TP-Command error
PDU not supported
SC busy
no SC subscription
SC system failure
invalid SME address
destination SME barred
SM Rejected-Duplicate SM
TP-VPF not supported
TP-VP not supported
SIM SMS storage full
no SMS storage capability in SIM
error in MS
memory Capacity Exceeded
SIM Application Toolkit Busy
unspecified error cause

ME failure
SMS service of ME reserved
operation not allowed
operation not supported
invalid PDU mode parameter
invalid text mode parameter
SIM not inserted
SIM PIN required
PH-SIM PIN required
SIM failure
SIM busy
SIM wrong
SIM PUK required
SIM PIN2 required
SIM PUK2 required
memory failure
invalid memory index
memory full
SMSC address unknown
no network service
network timeout
no +CNMA acknowledgement expected
unknown error

Hi Henk, thanks for the response.
We will be purchasing the full edition upon arrival of our modem