The only time the prison can lawfully hold a person is following a committal by the court, at that point they are remanded into prison custody and are handed over by the Police. The only exception to this rule is in immigration cases whereby the immigration service will issue a holding warrant and the person.
No...They will have access to a phone to ring you.
Mobile phones, alcohol, any drugs, firearms, ammunition, explosives, tobacco, flammable liquids, video and sound recording equipment, any edged or bladed implement or item that could be used as a weapon, any tools or any other item that is deemed unauthorized by the Superintendent under the Prison rules. Information will be provided and advertised on this site for any additions.
You can bring clothes and foodstuffs and some electrical equipment. All drinks must be in sealed bottle, foodstuffs must be packaged in such a way that they can be searched. Any other items must be approved before they can be brought in. Visitors must be aware that bringing a prohibited item into a prison is a criminal offense and you can be subject to arrest and charge.
Full details of visits and visit numbers can be found on this website.