SIERRA Wireless MC 8355 SIM will not connect with T-Mobile Service on Fujitsu T902 laptop

SIERRA Wireless MC 8355 SIM will not connect with T-Mobile Service on Fujitsu T902 laptop.
I installed a driver Windows Drivers for EM/MC Series Modules (Build 5087) from Sierra Wireless website and it started working for a day and then Stop connecting to service again. It’s keep saying No Service. It’s I insert same SIM on HP laptop it works fine as LTE (4G). Last time when SIM worked on Fujitsu T902 it worked as UMTS (3G). I assume I just need a correct driver. Is there any app which can give me the status for connectivity. ?

do you have modem port in device manager?
You can use AT command to check modem status.