btc-direct.fr = doesnt look trustworty and no info on min max if they have stock or not.
Their Twitter shows pretty frequent activity:
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https://twitter.com/#!/BtcDirect1There is a specific set of countries where this is supported:
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http://en.bitcoin.it/wiki/Btc-Direct(and 3 more were announced as coming soon, Mexico, South Africa and Morocco).
Long story short im looking for a reliable service to buy bitcoin with sms/phone to my customers.
Then perhaps you want to check into selling these:

It works like a prepaid card. You as the merchant have stock of blank cards and then at the point of sale you activate it, which loads the card with bitcoins. It will be available from Tangible Cryptography:
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http://bitcointalk.org/index.php?topic=87441.0Or you could sell the physical bitcoin cards (though the merchant holds the BTC in the stock's inventory):
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https://www.giftcoin.net/card/ Other options to sell them are here or coming soon.
For example, you could sell them and send the bitcoins to a mobile using Coinapult:
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https://coinapult.com/sms-wallet (U.S. and Canada numbers only, for now)
Or with WalletBit's WAP (WML) service:
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http://bitcointalk.org/index.php?topic=85684.0