This is the response from MTK:

<<
MTK feedback this question as bellow:
In your current version, error:3350 represents 
SM_LOCAL_REJECT_ACT_REQ_DUE_TO_GPRS_SUSPENDED.
The cause of this error code may be MM has some activity, when SM to activated. 
So suspend (ex, LU, RAU).
The error specific code cause also needs to further analysis based on log.
 
SM refers to the Session Management. MM refers to the Mobility Management.
Can be understood as the mobile phone trying to PDP activation, at the same 
time mobile phone need location update or location registration, so be 
suspended.
>>

It is worth noting that this is a 2G specific error code. This confirms
that the error is due to lack of radio resources. Probably, after having
just received the SMS we are not allowed due to limitations of GSM to
immediately attach to GPRS: we need to wait for a slot in the control
channel, or something similar. It can be argued that the modem FW should
wait until it is able to activate the context, and then it is a modem
bug, but it looks difficult to convince MTK of this.

In my opinion the retry logic in nuntium is a correct way to handle
this, as we always need to do retries as unexpected things (like this,
or others) can happen.

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https://bugs.launchpad.net/bugs/1380699

Title:
  org.ofono.Error.Failed: Operation failed when activating context

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