cinterion: modification to fetching unlock retries

[Colin Helliwell]

> On 14 April 2017 at 13:57 Colin Helliwell <colin.helliwell at ln-systems.com> wrote:
> 
> Some Cinterion modems support AT^SPIC to fetch the 'unlock retries', but some don't. Another method possibly available is to used AT+CSIM (as per Telit plugin).
> This aims to allow either method to be tried - if the first step of the first method fails (e.g. SPIC not supported), then try again using the alternate.

I need to analyse a bit further how the modems in my design behave - it may be that on e.g. BGS2 the best coverage comes from trying *both* methods....!