|Check network coverage:||giffgaff coverage||Tesco Mobile coverage|
|2nd generation network. Max data speed of 0.3 Mb per second.|
|3rd generation network. Max data speed of 42 Mbps.|
|4th generation network. Max data speed of 1 Gbps (1000 Mb/s).|
|5th generation network. Max data speed of 10 or 20 Gb/s.|
|Use Wi-Fi for mobile phone calls and texts when no network signal.|
|4G Calling (VoLTE)||No||No|
|Voice over LTE (4G Calling) makes clearer HD calls over 4G networks.|
|Unused mobile data allowance rolled over from one month to the next.|
|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 / 900 / 1800 / 2100 / 2300 MHz|
|3G (UMTS) Frequency||900 / 2100 MHz||900 / 2100 MHz|
|2G (GSM) Frequency||900 MHz||900 MHz|
giffgaff is a mobile telephone network running as a Mobile Virtual Network Operator (MVNO) using the United Kingdom O2 network. Owned by O2's owners Telefónica, giffgaff was launched on 25 November 2009.
About Tesco Mobile
Tesco Mobile is a mobile virtual network operator (MVNO) in the United Kingdom operated by Tesco, using the O2 network as its carrier.
On 30 January 2014, Tesco Mobile started offering 4G service for its Pay Monthly and Sim Only customers at no extra cost, extending the service to Pay As You Go customers on 24 July 2014.