USB modem works only after reinserting twice.

I  have a strange issue with my Arch Linux setup and ZTE WCDMA modem. I recently bought this modem and trying to connect to internet through wvdial. I initially thought that modem is not being detected under Arch Linux (as it was working fine under Ubuntu and Fedora). Later on I understood that the vendor/ product id is changing when I reinsert the modem. For example, When I insert the modem immedietly after boot, the following is shown as vendor/ product id and modem does not connect to internet:-
[sundar@arch ~]$ sudo lsusb
Bus 001 Device 008: ID 19d2:fff5 ZTE WCDMA Technologies MSM
Then I have to remove and reinsert the modem. This time device indicator (kde) and dolphin will show as another partition and vendor/ product id will change to following:-
Bus 001 Device 007: ID 19d2:fff1 ZTE WCDMA Technologies MSM
And without any issue modem will connect to the internet through wvdial. How do I over come this issue and connect to internet directly without removing modem?

Any idea?

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