For somebody who is mainly writing text messages (95%, 5% phone calls) to various providers such as orange, heya or play, which would be the cheapest provider to go with?
I can confirm this opinion regarding PLAY. We changed in my company from Orange to PLAY and this reduced my invoices for about 75% !!!
Especially Orange is using a lot of fancy tricks to cheat their clients: - the contracts are coming with a courier like UPS, the driver is waiting, you don't have any chance to read the contract before signing
or, either funny, - there is no phone number available to call the Orange accounting dept. without a Orange mobile. If you have a claim and you number is blocked, you are forced to pay before the case is solved.