Compare O2 vs. T-Mobile Network

Features
Network Provider O2 EE
Check network coverage: O2 coverage T-Mobile coverage
2G Network Yes Yes
2nd generation network. Max data speed of 0.3 Mb per second.
3G Network Yes Yes
3rd generation network. Max data speed of 42 Mbps.
4G Network Yes No
4th generation network. Max data speed of 1 Gbps (1000 Mb/s).
5G Network Yes No
5th generation network. Max data speed of 10 or 20 Gb/s.
WiFi Calling Yes No
Use Wi-Fi for mobile phone calls and texts when no network signal.
4G Calling (VoLTE) Yes No
Voice over LTE (4G Calling) makes clearer HD calls over 4G networks.
Data Rollover No No
Unused mobile data allowance rolled over from one month to the next.
Tethering Allowed Yes No
Tethering allows you to share your mobile internet with other devices.
Network Frequency Bands
5G (NR) Frequency 3500 MHz 3500 MHz
4G (LTE) Frequency 800 / 900 / 1800 / 2100 / 2300 MHz 800 / 1800 / 2100 / 2600 MHz
3G (UMTS) Frequency 900 / 2100 MHz 2100 MHz
2G (GSM) Frequency 900 MHz 1800 MHz

O2 is a mobile network operator and telecommunications services provider in the United Kingdom, under the company name of Telefonica UK Limited. The company was originally formed in 1985 as Cellnet by the BT Group and was one of the earliest mobile phone networks to launch in the UK, and later rebranded as O2 UK.

02 is one of the largest network operators in the UK and provides 2G, 3G, 4G and 5G services to millions of customers in the United Kingdom, as well as to other mobile virtual network operators (MVNO).

T-Mobile UK is a mobile network operator in the United Kingdom, owned by Deutsche Telekom since 1999, and originally launched as One2One.

In 2009, Deutsche Telekom and Orange SA announced that the T-Mobile network was to be merged with Orange UK in a joint venture with EE Limited to form the UK's largest mobile network.