Sony Ericsson T20e manual - page 8

8
The phone accesses WAP services over SMS or IP, where IP is provided over GSM Data. Typi-
cal differences which distinguish the bearer types are listed below this diagram.
GG
GGSS SSMM MM DD DDaa aattttaa aa AA AAcc cccc ccee eess ssss ss
• Circuit connection of data call means that the phone is connected during the WAP session.
• Connection-oriented WAP (user option) uses error recovery services to provide high reliabil-
ity.
• Comparably higher transmission speed than with SMS access.
• Pricing of GSM Data access can be compared to pricing of data calls in the network.
• GSM Data is suitable for Complex Pull services, Browsing and Data transfer.
• GSM Data is not suitable for Provisioning, Pager service.
SS
SSMM MMSS SS AA AAcc cccc ccee eess ssss ss
• SMS point-to-point is used and not SMS Cell Broadcast.
• The connection is maintained by the automatic exchange of ”messages” between the phone
and the SMS Service Center.
• Comparably lower transmission speed than with GSM Data access.
• Pricing of SMS access can be compared to pricing of the normal SMS in the network.
• SMS is suitable for Messaging services, Info services, Provisioning.
• SMS is not suitable for Browsing or Data transfer.
BB
BBee ee aa aa rr rree ee rr rr TT TTyy yy pp ppee ee CC CChh hhaa aa rr rraa aa cc cc tt ttee ee rr rriiiiss ss tt ttiiiicc cc ss ss