sorry MAT In answer to your query mobile phone can use (2) sims simultaneusly. Due to mix up Virgin supplied 2 sims with same phone number. Virgin salesman was not interested in set up because I bought the mobile on E-BAY. HOWEVER he fitted both sims and said I needed to set it up myself.. Ibelieve he i not know and installed the micro sim incorrectly ( 180 degrees ) Now it resulted in screen messages saying sim not fully in and /or no sim., resulting message of network not available./ ditto/ditto. Phone supplier advised resetting phone APN android SETTINGS for my carrier name as shown on google .Needless to say I am fed up after attempts with 3 people to solve the problem..Supplier has since sent E-mail with photo"s how to install sims and then instructions how to power on/off using ON/OFF at same time as VOLUME buttona few timesto get to factory mode. Then press volume button to select eMMC then press power button to re-boot "software" will stay at"welcome menu" a little long time,please wait if not ok . they will send return address.. NEEDLESS TO SAY STILL DOES NOT WORK.. the screen was locked on same chinese caracter after 2hrs30mins. SO RETURNING PHONE TO SUPPLIER VIA E-BAY. MY SAGA ENDS.. NOT BAD FOR 78 nearly 79 year old senior citizen George Denton.