MILAN (Reuters) -Telecom Italia (TIM) has started talks with a pool of banks for a new credit line worth around 3 billion euros ($3.3 billion) that could be partly guaranteed by Italy’s trade insurer SACE, three sources familiar with the matter said. The debt-laden former phone monopoly, hit by multiple rating downgrades following a record annual loss last year, is pressing ahead with plans to reorganise its business by spinning off assets. Telecom Italia has initiated talks with a pool of banks, including UniCredit, BNP Paribas, Credit Agricole and Santander over the credit line deal, the sou…