You might want to allow roaming

[zorgoban]

I'm having a hard time with the library because there is no documentation. Apart from that it seems quite complete.

I found one issue: It didn't recognize the roaming status as registered. For now I changed line 21 in gsm.c to: if (p2 == 1 || p2 == 5)

It might be desirable to be able to configure that, but for my purposes this is the solution.

Many Greetings! Remo