Maybe you can recommend some other good phones up to 250 Euro (~$270)?
I'll have to apologize, as when it comes to pricing recommendations I'm not one to really ask. I can go over specs and such, I don't own a cellphone, just tablet which I use wifi mesh network around town in a 3 mile radius roughly and with Google voice I get free unlimited voip calling over wifi with free number so I use it.
For other cases I'm a ham radio operator and we have 2 meter and 440 mhz band repeaters which have 'autopatch' connected, so we can use the dtmf keypad on our microphone to press *7 activates dialtone on repeater, then dial number and talk then press # to hang up. I've used that since 1994 so I've never owned a cellphone and for pricing I've never had a contract and don't even know what data plans, services, etc are offered.
I just know the technology :P
Last actual "commercial radio" device I had was a LCD 2 way pager in 1995ish-2000. Then ive always had landline/dsl for home.
I can help go over specs, and comparisons and offer my opinions though, I've had "unlocked" phones that a local cell company that was trashing older smart phones gave me free and I'd reflash with a basic version of android from google and install CyanogenMod (http://www.cyanogenmod.org/
) which ripped out the baseband code and turned the old smartphone into a "ipod touch" ripoff wifi only type device which I resold for $25-50 around town :P
I also jailbreak iphones/ old ipad/ipod touch for extra cash for townfolk, (there's nothing to it, but i do it for folks that know what it is, and want to squeeze a couple more years out of an old device apple no longer updates)
But I would rather defer "pricing" to someone else.
The top "brandings" for Android I recommend is Nexus or Samsung Galaxy.
But there are other really good brands that get excellent reviews, but they are pricey if purchasing an unlocked version. Here in states from what I've seen with pricing they price drops when you lock into a contract, and they have deals where you can get phone free with credit check and signing a 3 year contract. As I've not been a phone purchaser, that's why I'm not a good person to give advice on pricing, especially when I'm not sure how cell contracts work in other countries if they do contracts that reduce price and such.
But the top tier android device brands for the moment of this post are.
Nexus 6P (google's latest top tier phone) - https://www.google.com/nexus/6p/
unlocked it's $499
The Nexus 5X (google's moderate tier phone) - https://www.google.com/nexus/5x/
unlocked it's $349
The Nexus devices are cheaper than the competition top tier android, Samsung adds "bells and whistles" such as higher megapixel camera, sd card slot (a nice extra but any android you can plug usb hub, thumbdrive, sdcard reader into microusb charging port using OTG cable). And Samsung also modifies the android launcher, which some folks like Samsung's launcher, but on a bare Android device like Nexus you can install any launcher replacement from the playstore like Nova launcher is kinda popular. But each company has little hardware "extras" they add that makes them unique, there are some Broadcom 802.11 wifi chips that also have built in FM broadcast stereo reception capability (most all the broadcom chips have the capability, but the phone/tablet makers don't attach an antenna coil or connect the antenna pin to the headphone jack which lets it use the headphone wires as a 'low profile antenna').
So next on my opinion of the top tier
Samsung, they went all out on Android. They selection is a bit too wide though in my opinion and should consolidate their offerings a bit.
But their top tier is
The Samsung Galaxy S series, Edge and Edge+. The S7 releasing this year
This site has all 3 top tier samsung side by side specs, just to compare to other devices.
S6 versus S6 Edge versus S6 Edge+ :
The S6 cpu's are smoking fast 8 core cpu's, but overkill as majority of all apps aren't multi-threaded. But the 3d game engines like unreal/unity and such are. And some of the Navigation, photo manipulation, etc are.
The big factor to look at first is Ram, then GPU then the CPU in mobile devices for judging performance at least "spec performance". I also recommend not settling for less than 32 gigs of storage. A 16 gig device is usually only from 10-14gig useable due to OS, and preinstalled apps, and that storage will drop fast with a couple premium games/apps some music or web browser cache as well, and OS cache which dumps occasionally unless forced.
A regular Samsung S6 can be got with no money down at $576 unlocked from Verizon, but you pay 0 down, and $24/month for the device + $ service price.
That's how, in US, at least many will let ya buy the phone, but with good credit they'll not bill it all at once, they'll tack it on to your service bill.
The fine print is $24 for 24 months, after credit check of course.
Next up in my order I'd say LG G4, the G5 should be out this year.
LG G4 $599 unlocked.
The Moto X Pure edition $399.99 unlocked
I don't know about in reality, but the new Blackberry Priv, they've finally branched into Android instead of their old Blackberry OS. But the Blackberry Priv specs are top tier level, has pretty good reviews, but it's $699.99 unlocked, but Blackberry is also adding some costs due to name recognition, like Apple overcharges for that name.
I've rambled and tossed a bunch of info, you may already know, but again, someone else will have to go over prices as I'm not in the know on how different contracts/plans/0 down/then renting vs buying, etc. I don't know if they still do it, but some companies prior to smartphones, and when smartphones were new they'd give the phone seemingly "free" but you had a long contract 3-5 years, then you had the opportunity every 3 years or so to trade up to new model, if you traded to new model you reset the contract period. That way they subsidize the phone and they recoup the profit from your 3 to 5 years of service locked into a contract that would cost the price of the phone to break the contract.
I can give advice on computer pricing, laptop, tablets, any of those :P
but not personally owning a cellphone, I don't really know.
Also remember new generation devices should be coming this year the S7, S7 Edge and S7 notes have been mentioned.
Definitely search forums though. See what folks are using in your neck of the woods and bitching about or praising.
on google use search additions like
intext:"smartphone" +country +reviews +price
stuff like that, will help you pinpoint and dig google deeper than normal keywords.