The trial of Graham Dwyer for the murder of Elaine O'Hara has been told that two phones found in the Vartry Reservoir in Co Wicklow, after Ms O'Hara's remains were discovered, had only each other's phone numbers stored in their contacts lists.
Crime and policing analyst Sarah Skedd is giving evidence about her analysis of data connected with the two reservoir phones as well as her analysis of three other phone numbers and handsets.
The first phone found in the reservoir, which the prosecution says is connected with Ms O'Hara, had the other phone's 086 number stored as "mstr" - which the prosecution said was all the consonants from the word master.
The second phone, which the prosecution says is associated with Mr Dwyer had the first phone's number stored as "slv" - all the consonants from the word slave.
Ms Skedd is giving evidence about her analysis about the level of contact between the phones.
She also analysed the cell sites used by two mobile phones; the second reservoir phone and an 083 number, which the prosecution says are associated with Mr Dwyer and compared them with the movements of his work mobile phone.
Mr Dwyer denies the murder of Ms O'Hara at Killakee Mountain in Rathfarnham on 22 August 2012.
Ms Skedd told the court the two phones found in the Vartry Reservoir were almost entirely used to make contact with each other.
She said in terms of outgoing contact they were exclusively used to make contact with each other.
Ms Skedd said there were almost 1,500 text messages exchanged between the two mobile phones found in the reservoir between December 2011 and 22 of August.
The prosecution says one of these phones was connected to Ms O'Hara, the other to Mr Dwyer.
Ms Skedd said she identified 1,369 text messages, and 11 calls between the two phones - which were unanswered or went to voicemail, between 1 December 2011, the day after the phones were bought and 22 August 2012 - the day Ms O'Hara went missing.
She said she was able to identify the content of 268 text messages between the phones between 14 August and 22 August 2012.
She said the content of the other messages was not available.
She said Ms O' Hara's mobile phone was in limited contact with the reservoir phone associated with her.
She said there were five unanswered calls between January and August 2012.
She agreed this would be consistent with someone trying to find a second phone.
Ms Skedd said there was one phone call between Ms O'Hara's phone and the reservoir phone the prosecution says was connected with Mr Dwyer - this was a call to voicemail.
The court has also heard there were more than 2,500 text messages between Ms O'Hara's iPhone and an 083 number alleged to be associated with Mr Dwyer between March 2011 and July 2012.
Ms Skedd said she had found 2,637 text messages, one multi-media message, and one unanswered call between the two phones between 25 March 2011 and 12 July 2012.
She said she was able to identify the content of just over 2,300 of the messages.
Ms Skedd gave evidence about her comparison of the cell sites most frequently used to communicate with the mobile phone network by Mr Dwyer's work mobile phone and an 083 phone number, the prosecution alleges was used by him.
She found that the cell sites most frequently used by the 083 number were sites at ESB Headquarters in Dublin city centre and cell sites at the Rochestown Lodge hotel in south Co Dublin.
These were also the cell sites most commonly used by Mr Dwyer's 087 work phone.
The 083 number used cell sites at ESB headquarters on 325 occasions and cells at the Rochestown Lodge hotel on 136 occasions.
Ms Skedd said she analysed cell sites used by Mr Dwyer's work phone on days when the 083 phone or 086 reservoir phone alleged to be linked to him were active.
She found the cell sites most frequently used by Mr Dwyer's phone were also at ESB headquarters and at the Rochestown Lodge hotel.
She found his phone used cell sites at ESB Headquarters on 647 occasions and at the Rochestown Lodge hotel on 450 occasions.
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