I have found a nice easy way to get your Sprint Merlin S620 PCMCIA card to work on SLED10sp1, these steps will also work on SLED10, OpenSuSE10.1,10.2, and I am sure 10.3 when it comes out.

Step 1 : YAST
Step 2 : Open up Modem under Network Devices
Step 3 : Add a new modem
Step 4 : Modem device will be /dev/ttyUSB0 ; Dial prefix is blank ; Dial mode has tone dial checked; Special settings is left blank.
Step 5 : Select details on the screen from step 4; Baud rate is 230400 ; init 1 is ATZ ; init 2 is AT&F0 ; init 3 is ATE0V1 ; User control is not checked
Step 6 : On the ISP provider screen select NEW ; Make provider name SPRINT ; Phone number #777 ; User name is your 10-digit-phonenumber@sprintpcs.com ; password is blank ; Always ask for password is unchecked
Step 7 : Dial on demand is unchecked ; Everything else on the page can be left at default, Modify DNS checked, Automatic retrieve DNS checked, stupid mode unchecked, External firewall interface can be checked or unchecked, idle time 300, IP details does not need to be modified.
Step 8 : Finish and get out of YAST

Important there is a option file in /etc/ppp if you do not modify this file your connection will disconnect every 2 minutes. Read through the file and edit as root, use # to rem out the lines for ls echo.

Here are the lines I remed out using #
line 122 "lcp-echo-interval 30"
line 131 "lcp-echo-failure 4"
line 135 "lcp-max-configure 60"
line 138 "lcp-restart 2"
line 141 "idle 600"

Once you save this file you can left click on your network connection icon in the system panel, select dial up connections, and select connecto to sprint via modem0

It will take 10 to 20 seconds to get connected and get an IP address but your should be on your way. I am getting on average 700K down and 124K up with my sprint card.