MC37i is GPRS module:
1.Multislot Class 10
2.Full PBCCH support
3.Mobile Station Class B
4.Coding Scheme 1 - 4

GSM / GPRS features of MC37i:

Data transfer

GPRS:

Multislot Class 10
Full PBCCH support
Mobile Station Class B
Coding Scheme 1 - 4

CSD:
V.110, RLP, non-transparent
2.4, 4.8, 9.6, 14.4kbps
USSD

PPP-stack for GPRS data transfer

SMS

Point-to-point MT and MO
Cell broadcast
Text and PDU mode
Storage: SIM card plus 25 SMS locations in mobile equipment
Transmission of SMS alternatively over CSD or GPRS. Preferred mode can
be user defined.

Fax

Group 3; Class 2 and Class 1

Audio

Speech codecs:
Half Rate (ETS 06.20)
Full Rate (ETS 06.10)
Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
Adaptive Multi Rate AMR

Handsfree operation, echo cancellation, noise reduction, 7 different ringing
tones / melodies