I joined Nokia in Australia in 1994. This was when there were only around 13,000 employees globally at the time. I had been working with an engineer from one of the local operators and he was testing Mobile Originated SMS using the only phone at the time that supported it, the 2110. He gave a couple of us within the office access to the system and he said just go for it and they will monitor the results.
During my first trip to Finland for a sales conference, I decided to see if SMS roaming would work so I sent my colleague who was visiting Auckland at the time a text message. Lo and behold, I got a reply and the conversation carried on for around 40 minutes especially after the 2110 product manager saw what I was doing and grabbed a couple more guys to witness what could have been the first global SMS conversation by 2110.