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Flashing your mesmerize to work on verizon's network is fairly foolproof
I am currently using Fascinate ICS (Ice Cream Sandwich) ROM on my Showcase (Cell South) on PagePlus, which is the verizon network (cheap prepay service).
Basically you are flashing your mesmerize to mimic/become a fascinate
(loading new modem/radio software & new rom) via your PC.
I can upload the files & instructions for you if you want to try it yourself
You can literally do this in 15 minutes with USB cable, pc & downloaded programs, compliments of generous forums & developers
Initially I was afraid to full flash a complete fascinate rom/radio, but I took the plunge after I soft bricked my phone & installed the stock Verizon Gingerbread rom/radio EH03 & everything ran flawless 3g, mms, wifi, data.
I then rooted & upgraded to Kang ICS Build 2. LOVE IT!!
That's the easy part. Trying to get Verizon to activate it is the hard part, as Mesmerize/Showcase are not on Verizon's database, & they frown on using devices from other carriers.
HOWEVER, you can definitely flash to mimic a fascinate THEN use on ANY
verizon network that allows you to bring your own device (pageplus, possibly straight talk, some other verizon mvnos allow BYOD from other carriers)
PagePlus uses verizon's network & shared towers with super cheap rates
Right now, they are running a promo for their new 55 plan ... Unlimited Talk & Text & 1GB data for $55 flat per month (no taxes or add'l fees)
normally 55 plan includes 500mb (1/2GB). Additional data is pretty cheap too. No mandatory $30 data add on ... as a matter of fact I am on the 1200 talk 2000 text 100mb data which costs $29 for the entire plan.
If you are not locked into vzw, I highly recommend page plus you can setup an autopay, so you don't have to worry about renewals (I recommend kitty wireless) & you can quickly port your existing #.
If you are locked into verizon contract with EFT, you could
add a cheapie phone that doesn't require data, on cheapest plan they have & put your fassy on another carrier & likely still save money.
I have to say the Samsung Galaxy S (fascinate/mesmerize/showcase) is truly an incredibly versatile & cool phone.
I actually ported my cell # to googlevoice ($20) , & now I can use any carrier I want & forward to calls to my new/alternate cell #s. Everyone can still reach me using my old cell #.
If you are hesitant to flash yourself, PM me & I can recommend a flasher who will do it for you remotely for around $50 (more to get on actual VZW network tho)