Based on 3GPP TS 29.060 version 7.6.0 Release 7 #33
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Section 7.7.49
the Apn restriction has a value from 0 to 3
7.7.49 APN Restriction
The APN Restriction information element, when used in messages from the GGSN to the SGSN, contains an unsigned
integer value indicating the level of restriction imposed on primary PDP Contexts created to the associated APN. When
used in messages from the SGSN to GGSN, it contains an unsigned integer value indicating the highest level of
ETSI restriction type for all currently active PDP Contexts associated with the subscriber. In both cases, the meaning of the
value contained within the IE is as defined in 3GPP TS 23.060 [4], sub-clause 15.4.
The structure of the APN Restriction IE is as follows:
Bits
Octets 1 Type = 149 (Decimal)
Octets 2-3 Length
Octets 4 Restriction Type value