There are 6 feet in a fathom.

All your BTS are belong to us

In UK depending on ownership and/or type of material the copyright lasts for between 25 and 125 years. Hardly perpetual and infinite.

No. The article makes the mistake in thinking the the Radio part of the GSM bandwidth is the same as the Network bandwidth. It's not.

To continue the FedEx example, an SMS is like a post-it was was stuck onto your package. Trouble is the post-it might be going to a entirely different recipient to the parcel. So it's only piggy-backing until it reaches the sorting office.

Some networks work by store and forward of SMS much like email, others attempt direct delivery first. The point being that, if the recipient's phone is turned off, unlike a voice line you can't just give a busy signal (or charge extra for voice mail).

Where the article falls down is it's ignoring that the network understructure needs to handle and route SMS not just carry then from the handset to the mast.

There lot of suggestions but they all, so far, fall into
a) steping through the code (either with pen or debugger) or
b) giving you something in the in the absence of comments (doxygen etc).
All very sensible.

I'd add into the mix, profiling the running code.
See where it spends most of it's time, what you can ignore for later, and what you need to understand first.