Nokia's one billionth phone sold was a Nokia 1100 purchased in
The 1100a operates on the GSM-900/1800 network.
The 1100b operates on the GSM-850/1900 network
The 1100i adds a built-in Nokia prepaid tracker
The 1101 replaces the green backlighting with a white backlighting and adds a simple WAP 1.1 browser
The 1108 also replaces the green backlighting with a white backlighting.