It has been a long day. My fingertips are hurting from all the work. The trackers are basically complete. The world is good (until I need to build another 28 units).

But let me tell you the SIM Card story… After all I had promised it. A certain carrier issued my client with 80 new SIM cards for GPRS. My client wated their own APN, or Access Point on the GPRS network for security purposes. And the carrier said that this had been done. On the weekend, I found out that some of SIM cards worked on the default APN, and others did not work at all.

So I emailed my client. And they emailed the carrier. My client had been provided with a list of the serial numbers from the carrier, and just forwarded this back to the carrier, saying FIX THESE.

And so the carrier did. They ensured that all the SIM CARDS were connected to the correct APN. And when I tested them some of them rejected, and some worked on the normal (wrong) APN. So I rang my client. He asked for the serial number of the SIM. I read this out to him, and he could not find it. He then looked for another, and could not find it. So I sent him my spreadsheet of SIM serial numbers obtained from the SIM CARDS directly.

He rang me back, and let me know that only 3 of the 80 SIM cards that I had were on his list. It seems that the carrier gave him the wrong SIM CARDS.

And when they first fixed the problems they just fixed the problem – and ignored who owned the cards. Meaning that close to 80 other devices just stopped working whenthe APN was changed. Basically they just believed my client and did not check things themselves.

One big oops.