Possible Clues:

• Text necessity, often
• Ring is one example of the sort kept in a cell in America
• "Call Me Maybe" or "Operator (That's Not the Way It Feels)"?
• Ring one from 01-6758000
• Figure appropriate for a ring (perhaps getting engaged?)
• Wooer's request
• Big figure in communications
• Could dial up such a very large amount of money
• Contact info for person, booked earlier, now put in cell?
• Figure to call help: ten plus one adjusted a shade