One of SmsManager issue is the application crashed when starting service of more than one modem.

In this forum post http://smslib.org/forum/topic/number-of-gsm-modems-limit the creator of smslib said,
Make sure that the multiple-modem connectivity is ok. Many of the reported problems were attributed to usb hubs and stuff like that. From my experience, it's better to invest in a good multi-serial "intelligent" expansion board.


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