Compare iD Mobile with O2 Network

Features
Network Provider Three O2
Check network coverage: iD Mobile coverage O2 coverage
5G Network Yes Yes
5th generation network. Max data speed of 10 or 20 Gb/s.
4G Network Yes Yes
4th generation network. Max data speed of 1 Gbps (1000 Mb/s).
3G Network Yes Yes
3rd generation network. Max data speed of 42 Mbps.
2G Network No Yes
2nd generation network. Max data speed of 0.3 Mb per second.
WiFi Calling Yes Yes
Use Wi-Fi for mobile phone calls and texts when no network signal.
4G Calling (VoLTE) Yes Yes
Voice over LTE (4G Calling) makes clearer HD calls over 4G networks.
Data Rollover Yes No
Unused mobile data allowance rolled over from one month to the next.
Tethering Allowed Yes Yes
Tethering allows you to share your mobile internet with other devices.
eSIM No Yes
e-SIMs are digital virtual SIM cards downloaded onto supported mobile handsets.
Network Frequency Bands
5G (NR) Frequency 3500 MHz 3500 MHz
4G (LTE) Frequency 800 / 1500 / 1800 / 2100 MHz 800 / 900 / 1800 / 2100 / 2300 MHz
3G (UMTS) Frequency 2100 MHz 900 / 2100 MHz
2G (GSM) Frequency N/A MHz 900 MHz

iD Mobile is a mobile virtual network operator (MVNO) operating in the United Kingdom as iD Mobile Limited, using the Three network. It is owned by Carphone Warehouse and was launched on 12 May 2015.

ID Mobile offer 1 month, 12 months and 24 months SIM only deals, as well as 24 month mobile phone (handset device + SIM) contracts, or Pay As You Go SIMs with no contracts or credit checks.

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).