Figures obtained in a Freedom of Information request (FOI) have revealed that nearly 2,000 mobile phones have been confiscated from prisoners in Scotland.
The data, obtained by the Scottish Conservatives, said that phones which were provided to prisoners earlier in the pandemic should now be withdrawn after a rule breaches.
Around 7,600 purportedly tamper-proof phones were given to inmates to replace in-person visiting due to covid, however many devices were modified by the prisoners in order to make calls to unauthorised numbers.
It is said that prison staff have now raised concerns they are being used to organise drug deals.
Figures from the Scottish Prison Service show that 1,899 mobile phones were temporarily seized in Scotland's prisons since May 2020 with the highest being in Glasgow's HMP Barlinnie with 342 confiscations.
This was followed by HMP Edinburgh with 262.
Scottish Conservative MSP Russell Findlay said: "This scheme was introduced in good faith at the start of lockdown but it has become a farce.
"These supposedly unhackable handsets were compromised almost immediately yet this was kept secret from the public and MSPs.
"It is absolutely right that prisoners should have access to their families but this ill-conceived scheme has backfired badly.
"Keith Brown dithered over our demands to stop drug-soaked prison mail before finally introducing new security measures.
He continued: "They must be withdrawn immediately and permanently, and any replacement must be safe and secure."
A Scottish Prison Service spokesman added: "If we find anybody attempting to tamper with phones whether maliciously or otherwise then we take appropriate action."
He said the phones have been useful in maintaining family links for those in custody, particularly during the coronavirus pandemic, and calls have also been made to the Samaritans and other agencies showing they provide an outlet for mental health concerns.
He added: "We are fully supportive of them continuing in use."
