And if you want to end or switch a contract out, there is a high cost to pay.
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Once a delivery point becomes established it is expensive for users, such as grain dealers, to switch to a contract with a different delivery point.
TPI's Allen says that half choose to switch service providers after the contract has expired.
The 62-year-old says his wife is planning a similar switch when her two-year Verizon contract expires.
Current BT Infinity customers will be able to switch to the faster products by starting a new contract, at no extra cost.
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Brawn have yet to confirm their 2010 driver line-up with new champion Button set to be rewarded with an improved contract and reports linking Rosberg to a switch after his Williams departure.
Current customers are not required to switch to the new plans, but can choose to do so without a contract extension.
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As part of the cascade of driver moves that will follow Alonso's switch, BMW Sauber's Robert Kubica is understood to have signed a contract to replace Alonso at Renault.
Of course, many people who switch to T-Mobile to free themselves from the shackles of a two-year contract will bring their own phone with them.
Alonso's switch to Ferrari has been an open secret in F1 for weeks and BBC Sport understands he signed his contract as long ago as July 2008.
Walgreen has been dogged in the wake of its contract dispute with pharmacy benefit firm Express Scripts (ESRX) which has caused a flood of customers to switch to rival pharmacies that were in Express Scripts networks.
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