Incentivise
Incentivise, incentivise, incentivise. A recent study placed this as number one in importance in getting customers to accept text marketing.
Incentives can take many forms, it could be a voucher that can be redeemed by replying, visiting the store or entering it on your website.
The exact incentive will be dependant on your business but offering one is key.
Make it relevant
The message must be relevant to what the recipient requested. Sounds obvious but many companies fail to follow this rule.
For example, don't send special holiday offers for Greece to somebody who has expressed an interest in receiving information about flights to Spain.
Keep the information relevant to the request and your customers will respond and your sales and customer interaction will soar.