I also had a one2one mobile phone, or as the network was dubbed by many, one2no one
I still had a One2One SIM in my phone until a few years ago. I think it was only when I changed to a 4G contract that they sent me a new one.
The early contracts had free evening (and weekend?) calls and the network got busy after 6 as people would ring numbers and have long conversations and there were some who realised they could be used as very good quality baby monitors for the evening.
I believe those contracts ere very sought after and many didn't change contracts or upgrade so they kept them well into the T-Mobile era. Not as unique an offer these days though
Yes, and my phone, a Nokia brick, had a full size ( by full I mean credit card sized) SIM. Which is why even today some new SIMs are still delivered mounted in a credit card template.
Roaming agreements took a while, I rembemer May 1997 going to Montreux. One2One boasted you could could roam in Switzerland. Great I thought. Landed at Geneva and sure enough there was a network, called ‘City Tel’, that was a clue to take note of ! As I reached the suburbs of Geneva the signal vanished and that was that. Nothing beyond the city. When I reached Montreux I borrowed a colleague’s Cellnet phone that was firmly connected to SFR CH and phoned One2One customer services who admitted ‘roaming in Switzerland’ in reality meant ‘Geneva’.