What is the most successful phone company?
In India, the most successful mobile company is 'NOKIA'.
If the phone was provided by the company, then yes; a phone provided by the company, and paid for by the company, is the company's phone, and must be surrendered to the company when you leave unless other arrangements are made. If you do not return the company property to the company, the company can swear out a complaint for theft, and if the phone is valuable, you can get arrested for it.
What was the name of the main rival of the chamberlains men and what was the name of their playhouse?
Burbage' company (which Shakespeare worked for) began as the Lord Chamberlain's Men, and later became the Kings Men. They were the most successful players' company in Elizabethan London. The next most successful company was Edward Alleyn's Admiral's Men. Christopher Marlowe worked for them before his murder, and they are also the company we know most of (since their manager/ banker - Philip Henslowe - kept a diary).